64940137 has 2 divisors, whose sum is σ = 64940138. Its totient is φ = 64940136.

The previous prime is 64940131. The next prime is 64940159. The reversal of 64940137 is 73104946.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62663056 + 2277081 = 7916^2 + 1509^2 .

It is a cyclic number.

It is not a de Polignac number, because 64940137 - 2²³ = 56551529 is a prime.

It is not a weakly prime, because it can be changed into another prime (64940131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32470068 + 32470069.

It is an arithmetic number, because the mean of its divisors is an integer number (32470069).

Almost surely, 2^64940137 is an apocalyptic number.

It is an amenable number.

64940137 is a deficient number, since it is larger than the sum of its proper divisors (1).

64940137 is an equidigital number, since it uses as much as digits as its factorization.

64940137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 64940137 is about 8058.5443474613. The cubic root of 64940137 is about 401.9491057901.

The spelling of 64940137 in words is "sixty-four million, nine hundred forty thousand, one hundred thirty-seven".