921538855 has 16 divisors (see below), whose sum is σ = 1168408800. Its totient is φ = 695813760.

The previous prime is 921538819. The next prime is 921538867. The reversal of 921538855 is 558835129.

It is not a de Polignac number, because 921538855 - 2¹⁷ = 921407783 is a prime.

It is a super-2 number, since 2×921538855² = 1698467722549422050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 7525 + ... + 43585.

It is an arithmetic number, because the mean of its divisors is an integer number (73025550).

Almost surely, 2^921538855 is an apocalyptic number.

921538855 is a gapful number since it is divisible by the number (95) formed by its first and last digit.

921538855 is a deficient number, since it is larger than the sum of its proper divisors (246869945).

921538855 is a wasteful number, since it uses less digits than its factorization.

921538855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36354.

The product of its digits is 432000, while the sum is 46.

The square root of 921538855 is about 30356.8584507686. The cubic root of 921538855 is about 973.1307970426.

The spelling of 921538855 in words is "nine hundred twenty-one million, five hundred thirty-eight thousand, eight hundred fifty-five".