164391431 has 2 divisors, whose sum is σ = 164391432. Its totient is φ = 164391430.

The previous prime is 164391389. The next prime is 164391443. The reversal of 164391431 is 134193461.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-164391431 is a prime.

It is a super-2 number, since 2×164391431² = 54049085172455522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (164390431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82195715 + 82195716.

It is an arithmetic number, because the mean of its divisors is an integer number (82195716).

Almost surely, 2^164391431 is an apocalyptic number.

164391431 is a deficient number, since it is larger than the sum of its proper divisors (1).

164391431 is an equidigital number, since it uses as much as digits as its factorization.

164391431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 32.

The square root of 164391431 is about 12821.5221795230. The cubic root of 164391431 is about 547.8055046635.

The spelling of 164391431 in words is "one hundred sixty-four million, three hundred ninety-one thousand, four hundred thirty-one".