210664431 has 24 divisors (see below), whose sum is σ = 308374560. Its totient is φ = 138571776.

The previous prime is 210664417. The next prime is 210664471. The reversal of 210664431 is 134466012.

210664431 is a `hidden beast` number, since 2 + 10 + 6 + 644 + 3 + 1 = 666.

It is not a de Polignac number, because 210664431 - 2⁶ = 210664367 is a prime.

It is a super-2 number, since 2×210664431² = 88759004977107522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 210664395 and 210664404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210664471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 364815 + ... + 365391.

It is an arithmetic number, because the mean of its divisors is an integer number (12848940).

Almost surely, 2^210664431 is an apocalyptic number.

210664431 is a deficient number, since it is larger than the sum of its proper divisors (97710129).

210664431 is a wasteful number, since it uses less digits than its factorization.

210664431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1055 (or 1052 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 210664431 is about 14514.2836888356. The cubic root of 210664431 is about 595.0184124425.

The spelling of 210664431 in words is "two hundred ten million, six hundred sixty-four thousand, four hundred thirty-one".