90329131897 has 2 divisors, whose sum is σ = 90329131898. Its totient is φ = 90329131896.

The previous prime is 90329131891. The next prime is 90329131957. The reversal of 90329131897 is 79813192309.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71890479376 + 18438652521 = 268124^2 + 135789^2 .

It is a cyclic number.

It is not a de Polignac number, because 90329131897 - 2¹⁹ = 90328607609 is a prime.

It is not a weakly prime, because it can be changed into another prime (90329131891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45164565948 + 45164565949.

It is an arithmetic number, because the mean of its divisors is an integer number (45164565949).

Almost surely, 2^90329131897 is an apocalyptic number.

It is an amenable number.

90329131897 is a deficient number, since it is larger than the sum of its proper divisors (1).

90329131897 is an equidigital number, since it uses as much as digits as its factorization.

90329131897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 734832, while the sum is 52.

The spelling of 90329131897 in words is "ninety billion, three hundred twenty-nine million, one hundred thirty-one thousand, eight hundred ninety-seven".