900780169 has 3 divisors (see below), whose sum is σ = 900810183. Its totient is φ = 900750156.

The previous prime is 900780163. The next prime is 900780203. The reversal of 900780169 is 961087009.

The square root of 900780169 is 30013.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 961087009 = 12197 ⋅78797.

It can be written as a sum of positive squares in only one way, i.e., 60025 + 900720144 = 245^2 + 30012^2 .

It is not a de Polignac number, because 900780169 - 2⁹ = 900779657 is a prime.

It is a super-2 number, since 2×900780169² = 1622809825727337122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (900780163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 15007 + ... + 45019.

It is an arithmetic number, because the mean of its divisors is an integer number (300270061).

Almost surely, 2^900780169 is an apocalyptic number.

900780169 is the 30013-rd square number.

900780169 is the 15007-th centered octagonal number.

It is an amenable number.

900780169 is a deficient number, since it is larger than the sum of its proper divisors (30014).

900780169 is an frugal number, since it uses more digits than its factorization.

900780169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60026 (or 30013 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 40.

The cubic root of 900780169 is about 965.7682836209.

The spelling of 900780169 in words is "nine hundred million, seven hundred eighty thousand, one hundred sixty-nine".