64709831 has 2 divisors, whose sum is σ = 64709832. Its totient is φ = 64709830.

The previous prime is 64709783. The next prime is 64709851. The reversal of 64709831 is 13890746.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64709831 - 2¹⁰ = 64708807 is a prime.

It is a super-2 number, since 2×64709831² = 8374724456097122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64709851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32354915 + 32354916.

It is an arithmetic number, because the mean of its divisors is an integer number (32354916).

Almost surely, 2^64709831 is an apocalyptic number.

64709831 is a deficient number, since it is larger than the sum of its proper divisors (1).

64709831 is an equidigital number, since it uses as much as digits as its factorization.

64709831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 64709831 is about 8044.2421022741. The cubic root of 64709831 is about 401.4733807924.

The spelling of 64709831 in words is "sixty-four million, seven hundred nine thousand, eight hundred thirty-one".