64099381 has 2 divisors, whose sum is σ = 64099382. Its totient is φ = 64099380.

The previous prime is 64099379. The next prime is 64099393. The reversal of 64099381 is 18399046.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45900625 + 18198756 = 6775^2 + 4266^2 .

It is a cyclic number.

It is not a de Polignac number, because 64099381 - 2¹ = 64099379 is a prime.

It is a super-2 number, since 2×64099381² = 8217461289166322, which contains 22 as substring.

Together with 64099379, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64099081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32049690 + 32049691.

It is an arithmetic number, because the mean of its divisors is an integer number (32049691).

Almost surely, 2^64099381 is an apocalyptic number.

It is an amenable number.

64099381 is a deficient number, since it is larger than the sum of its proper divisors (1).

64099381 is an equidigital number, since it uses as much as digits as its factorization.

64099381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 64099381 is about 8006.2089030951. The cubic root of 64099381 is about 400.2069366746.

The spelling of 64099381 in words is "sixty-four million, ninety-nine thousand, three hundred eighty-one".