64913137 has 4 divisors (see below), whose sum is σ = 64934260. Its totient is φ = 64892016.

The previous prime is 64913119. The next prime is 64913141. The reversal of 64913137 is 73131946.

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

It can be written as a sum of positive squares in 2 ways, for example, as 38452401 + 26460736 = 6201^2 + 5144^2 .

It is a cyclic number.

It is not a de Polignac number, because 64913137 - 2¹⁵ = 64880369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64913437) 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 3 ways as a sum of consecutive naturals, for example, 4962 + ... + 12427.

It is an arithmetic number, because the mean of its divisors is an integer number (16233565).

Almost surely, 2^64913137 is an apocalyptic number.

It is an amenable number.

64913137 is a deficient number, since it is larger than the sum of its proper divisors (21123).

64913137 is a wasteful number, since it uses less digits than its factorization.

64913137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21122.

The product of its digits is 13608, while the sum is 34.

The square root of 64913137 is about 8056.8689327803. The cubic root of 64913137 is about 401.8933922732.

The spelling of 64913137 in words is "sixty-four million, nine hundred thirteen thousand, one hundred thirty-seven".