64343491 has 2 divisors, whose sum is σ = 64343492. Its totient is φ = 64343490.

The previous prime is 64343479. The next prime is 64343497. The reversal of 64343491 is 19434346.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64343491 - 2¹⁵ = 64310723 is a prime.

It is not a weakly prime, because it can be changed into another prime (64343497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32171745 + 32171746.

It is an arithmetic number, because the mean of its divisors is an integer number (32171746).

Almost surely, 2^64343491 is an apocalyptic number.

64343491 is a deficient number, since it is larger than the sum of its proper divisors (1).

64343491 is an equidigital number, since it uses as much as digits as its factorization.

64343491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 34.

The square root of 64343491 is about 8021.4394593489. The cubic root of 64343491 is about 400.7143298229.

The spelling of 64343491 in words is "sixty-four million, three hundred forty-three thousand, four hundred ninety-one".