900181 has 4 divisors (see below), whose sum is σ = 902272. Its totient is φ = 898092.

The previous prime is 900169. The next prime is 900187. The reversal of 900181 is 181009.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 181009 = 31 ⋅5839.

It is a cyclic number.

It is not a de Polignac number, because 900181 - 2⁵ = 900149 is a prime.

It is a super-2 number, since 2×900181² = 1620651665522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (900187) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135 + ... + 1348.

It is an arithmetic number, because the mean of its divisors is an integer number (225568).

2⁹⁰⁰¹⁸¹ is an apocalyptic number.

It is an amenable number.

900181 is a deficient number, since it is larger than the sum of its proper divisors (2091).

900181 is a wasteful number, since it uses less digits than its factorization.

900181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2090.

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 900181 is about 948.7786886308. The cubic root of 900181 is about 96.5554103815. Note that the first 3 decimals are identical.

It can be divided in two parts, 900 and 181, that added together give a triangular number (1081 = T₄₆).

The spelling of 900181 in words is "nine hundred thousand, one hundred eighty-one".