216791925 has 36 divisors (see below), whose sum is σ = 416955456. Its totient is φ = 99103200.

The previous prime is 216791923. The next prime is 216791929. The reversal of 216791925 is 529197612.

It is not a de Polignac number, because 216791925 - 2¹ = 216791923 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216791923) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 25821 + ... + 33170.

It is an arithmetic number, because the mean of its divisors is an integer number (11582096).

Almost surely, 2^216791925 is an apocalyptic number.

216791925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

216791925 is a deficient number, since it is larger than the sum of its proper divisors (200163531).

216791925 is a wasteful number, since it uses less digits than its factorization.

216791925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59018 (or 59006 counting only the distinct ones).

The product of its digits is 68040, while the sum is 42.

The square root of 216791925 is about 14723.8556431391. The cubic root of 216791925 is about 600.7323695832.

The spelling of 216791925 in words is "two hundred sixteen million, seven hundred ninety-one thousand, nine hundred twenty-five".