900670921 has 4 divisors (see below), whose sum is σ = 901204612. Its totient is φ = 900137232.

The previous prime is 900670891. The next prime is 900670943. The reversal of 900670921 is 129076009.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 129076009 = 1039 ⋅124231.

It can be written as a sum of positive squares in 2 ways, for example, as 563397696 + 337273225 = 23736^2 + 18365^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-900670921 is a prime.

It is a super-2 number, since 2×900670921² = 1622416215869976482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (900670321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 264306 + ... + 267691.

It is an arithmetic number, because the mean of its divisors is an integer number (225301153).

Almost surely, 2^900670921 is an apocalyptic number.

It is an amenable number.

900670921 is a deficient number, since it is larger than the sum of its proper divisors (533691).

900670921 is a wasteful number, since it uses less digits than its factorization.

900670921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 533690.

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 900670921 is about 30011.1799334848. The cubic root of 900670921 is about 965.7292387563.

The spelling of 900670921 in words is "nine hundred million, six hundred seventy thousand, nine hundred twenty-one".