921923137 has 4 divisors (see below), whose sum is σ = 953713620. Its totient is φ = 890132656.

The previous prime is 921923077. The next prime is 921923147. The reversal of 921923137 is 731329129.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 185940496 + 735982641 = 13636^2 + 27129^2 .

It is a cyclic number.

It is not a de Polignac number, because 921923137 - 2²³ = 913534529 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 921923096 and 921923105.

It is not an unprimeable number, because it can be changed into a prime (921923147) 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, 15895198 + ... + 15895255.

It is an arithmetic number, because the mean of its divisors is an integer number (238428405).

Almost surely, 2^921923137 is an apocalyptic number.

It is an amenable number.

921923137 is a deficient number, since it is larger than the sum of its proper divisors (31790483).

921923137 is a wasteful number, since it uses less digits than its factorization.

921923137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31790482.

The product of its digits is 20412, while the sum is 37.

The square root of 921923137 is about 30363.1872009511. The cubic root of 921923137 is about 973.2660435305.

The spelling of 921923137 in words is "nine hundred twenty-one million, nine hundred twenty-three thousand, one hundred thirty-seven".