64361491 has 2 divisors, whose sum is σ = 64361492. Its totient is φ = 64361490.

The previous prime is 64361489. The next prime is 64361503. The reversal of 64361491 is 19416346.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64361491 - 2¹ = 64361489 is a prime.

Together with 64361489, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (64361191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32180745 + 32180746.

It is an arithmetic number, because the mean of its divisors is an integer number (32180746).

Almost surely, 2^64361491 is an apocalyptic number.

64361491 is a deficient number, since it is larger than the sum of its proper divisors (1).

64361491 is an equidigital number, since it uses as much as digits as its factorization.

64361491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 34.

The square root of 64361491 is about 8022.5613740251. The cubic root of 64361491 is about 400.7516927601.

The spelling of 64361491 in words is "sixty-four million, three hundred sixty-one thousand, four hundred ninety-one".