216971625 has 32 divisors (see below), whose sum is σ = 388821888. Its totient is φ = 106814400.

The previous prime is 216971567. The next prime is 216971647. The reversal of 216971625 is 526179612.

It is not a de Polignac number, because 216971625 - 2⁹ = 216971113 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

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 31 ways as a sum of consecutive naturals, for example, 17379 + ... + 27128.

It is an arithmetic number, because the mean of its divisors is an integer number (12150684).

Almost surely, 2^216971625 is an apocalyptic number.

216971625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

216971625 is a deficient number, since it is larger than the sum of its proper divisors (171850263).

216971625 is a wasteful number, since it uses less digits than its factorization.

216971625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44538 (or 44528 counting only the distinct ones).

The product of its digits is 45360, while the sum is 39.

The square root of 216971625 is about 14729.9567209140. The cubic root of 216971625 is about 600.8983071803.

The spelling of 216971625 in words is "two hundred sixteen million, nine hundred seventy-one thousand, six hundred twenty-five".