64739531 has 2 divisors, whose sum is σ = 64739532. Its totient is φ = 64739530.

The previous prime is 64739527. The next prime is 64739557. The reversal of 64739531 is 13593746.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64739531 - 2² = 64739527 is a prime.

It is a super-2 number, since 2×64739531² = 8382413748199922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (64739581) 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, 32369765 + 32369766.

It is an arithmetic number, because the mean of its divisors is an integer number (32369766).

Almost surely, 2^64739531 is an apocalyptic number.

64739531 is a deficient number, since it is larger than the sum of its proper divisors (1).

64739531 is an equidigital number, since it uses as much as digits as its factorization.

64739531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 68040, while the sum is 38.

The square root of 64739531 is about 8046.0879314111. The cubic root of 64739531 is about 401.5347930769.

The spelling of 64739531 in words is "sixty-four million, seven hundred thirty-nine thousand, five hundred thirty-one".