31563329548397 has 4 divisors (see below), whose sum is σ = 31569134837916. Its totient is φ = 31557524258880.

The previous prime is 31563329548367. The next prime is 31563329548417. The reversal of 31563329548397 is 79384592336513.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19307490852841 + 12255838695556 = 4394029^2 + 3500834^2 .

It is a cyclic number.

It is not a de Polignac number, because 31563329548397 - 2⁸ = 31563329548141 is a prime.

It is a super-2 number, since 2×31563329548397² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31563329548327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2902636604 + ... + 2902647477.

It is an arithmetic number, because the mean of its divisors is an integer number (7892283709479).

Almost surely, 2^{31563329548397} is an apocalyptic number.

It is an amenable number.

31563329548397 is a deficient number, since it is larger than the sum of its proper divisors (5805289519).

31563329548397 is an equidigital number, since it uses as much as digits as its factorization.

31563329548397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5805289518.

The product of its digits is 440899200, while the sum is 68.

The spelling of 31563329548397 in words is "thirty-one trillion, five hundred sixty-three billion, three hundred twenty-nine million, five hundred forty-eight thousand, three hundred ninety-seven".