64881431 has 2 divisors, whose sum is σ = 64881432. Its totient is φ = 64881430.

The previous prime is 64881403. The next prime is 64881437. The reversal of 64881431 is 13418846.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64881431 is a prime.

It is a super-2 number, since 2×64881431² = 8419200177215522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 64881391 and 64881400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64881437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32440715 + 32440716.

It is an arithmetic number, because the mean of its divisors is an integer number (32440716).

Almost surely, 2^64881431 is an apocalyptic number.

64881431 is a deficient number, since it is larger than the sum of its proper divisors (1).

64881431 is an equidigital number, since it uses as much as digits as its factorization.

64881431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18432, while the sum is 35.

The square root of 64881431 is about 8054.9010546375. The cubic root of 64881431 is about 401.8279483704.

The spelling of 64881431 in words is "sixty-four million, eight hundred eighty-one thousand, four hundred thirty-one".