89971547431 has 2 divisors, whose sum is σ = 89971547432. Its totient is φ = 89971547430.

The previous prime is 89971547389. The next prime is 89971547441. The reversal of 89971547431 is 13474517998.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 89971547431 - 2⁹ = 89971546919 is a prime.

It is a super-2 number, since 2×89971547431² (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 (89971547441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44985773715 + 44985773716.

It is an arithmetic number, because the mean of its divisors is an integer number (44985773716).

Almost surely, 2^89971547431 is an apocalyptic number.

89971547431 is a deficient number, since it is larger than the sum of its proper divisors (1).

89971547431 is an equidigital number, since it uses as much as digits as its factorization.

89971547431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7620480, while the sum is 58.

The spelling of 89971547431 in words is "eighty-nine billion, nine hundred seventy-one million, five hundred forty-seven thousand, four hundred thirty-one".