97891589 has 2 divisors, whose sum is σ = 97891590. Its totient is φ = 97891588.

The previous prime is 97891579. The next prime is 97891601. The reversal of 97891589 is 98519879.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57123364 + 40768225 = 7558^2 + 6385^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-97891589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97891579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48945794 + 48945795.

It is an arithmetic number, because the mean of its divisors is an integer number (48945795).

Almost surely, 2^97891589 is an apocalyptic number.

It is an amenable number.

97891589 is a deficient number, since it is larger than the sum of its proper divisors (1).

97891589 is an equidigital number, since it uses as much as digits as its factorization.

97891589 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1632960, while the sum is 56.

The square root of 97891589 is about 9894.0178390783. The cubic root of 97891589 is about 460.8735589919.

The spelling of 97891589 in words is "ninety-seven million, eight hundred ninety-one thousand, five hundred eighty-nine".