85904649431 has 2 divisors, whose sum is σ = 85904649432. Its totient is φ = 85904649430.

The previous prime is 85904649367. The next prime is 85904649487. The reversal of 85904649431 is 13494640958.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85904649431 - 2⁶ = 85904649367 is a prime.

It is a super-2 number, since 2×85904649431² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85904642431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42952324715 + 42952324716.

It is an arithmetic number, because the mean of its divisors is an integer number (42952324716).

Almost surely, 2^85904649431 is an apocalyptic number.

85904649431 is a deficient number, since it is larger than the sum of its proper divisors (1).

85904649431 is an equidigital number, since it uses as much as digits as its factorization.

85904649431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3732480, while the sum is 53.

The spelling of 85904649431 in words is "eighty-five billion, nine hundred four million, six hundred forty-nine thousand, four hundred thirty-one".