164688431 has 4 divisors (see below), whose sum is σ = 168705264. Its totient is φ = 160671600.

The previous prime is 164688421. The next prime is 164688439. The reversal of 164688431 is 134886461.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-164688431 is a prime.

It is a super-2 number, since 2×164688431² = 54244558610483522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41), and also a Moran number because the ratio is a prime number: 4016791 = 164688431 / (1 + 6 + 4 + 6 + 8 + 8 + 4 + 3 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164688439) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2008355 + ... + 2008436.

It is an arithmetic number, because the mean of its divisors is an integer number (42176316).

Almost surely, 2^164688431 is an apocalyptic number.

164688431 is a deficient number, since it is larger than the sum of its proper divisors (4016833).

164688431 is an equidigital number, since it uses as much as digits as its factorization.

164688431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4016832.

The product of its digits is 110592, while the sum is 41.

The square root of 164688431 is about 12833.0990411514. The cubic root of 164688431 is about 548.1352062621.

The spelling of 164688431 in words is "one hundred sixty-four million, six hundred eighty-eight thousand, four hundred thirty-one".