64694131 has 2 divisors, whose sum is σ = 64694132. Its totient is φ = 64694130.

The previous prime is 64694089. The next prime is 64694141. The reversal of 64694131 is 13149646.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64694131 - 2¹³ = 64685939 is a prime.

It is a super-2 number, since 2×64694131² = 8370661171690322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (64694141) by changing a digit.

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 as a sum of consecutive naturals, namely, 32347065 + 32347066.

It is an arithmetic number, because the mean of its divisors is an integer number (32347066).

Almost surely, 2^64694131 is an apocalyptic number.

64694131 is a deficient number, since it is larger than the sum of its proper divisors (1).

64694131 is an equidigital number, since it uses as much as digits as its factorization.

64694131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 34.

The square root of 64694131 is about 8043.2661898013. The cubic root of 64694131 is about 401.4409094672.

The spelling of 64694131 in words is "sixty-four million, six hundred ninety-four thousand, one hundred thirty-one".