64012391 has 2 divisors, whose sum is σ = 64012392. Its totient is φ = 64012390.

The previous prime is 64012379. The next prime is 64012397. The reversal of 64012391 is 19321046.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64012391 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64012391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64012397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32006195 + 32006196.

It is an arithmetic number, because the mean of its divisors is an integer number (32006196).

Almost surely, 2^64012391 is an apocalyptic number.

64012391 is a deficient number, since it is larger than the sum of its proper divisors (1).

64012391 is an equidigital number, since it uses as much as digits as its factorization.

64012391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 64012391 is about 8000.7744000190. The cubic root of 64012391 is about 400.0258129175.

It can be divided in two parts, 640 and 12391, that added together give a palindrome (13031).

The spelling of 64012391 in words is "sixty-four million, twelve thousand, three hundred ninety-one".