31475338897 has 2 divisors, whose sum is σ = 31475338898. Its totient is φ = 31475338896.

The previous prime is 31475338883. The next prime is 31475338901. The reversal of 31475338897 is 79883357413.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22677649281 + 8797689616 = 150591^2 + 93796^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31475338897 is a prime.

It is not a weakly prime, because it can be changed into another prime (31475338837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15737669448 + 15737669449.

It is an arithmetic number, because the mean of its divisors is an integer number (15737669449).

Almost surely, 2^31475338897 is an apocalyptic number.

It is an amenable number.

31475338897 is a deficient number, since it is larger than the sum of its proper divisors (1).

31475338897 is an equidigital number, since it uses as much as digits as its factorization.

31475338897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15240960, while the sum is 58.

The spelling of 31475338897 in words is "thirty-one billion, four hundred seventy-five million, three hundred thirty-eight thousand, eight hundred ninety-seven".