31125373505 has 4 divisors (see below), whose sum is σ = 37350448212. Its totient is φ = 24900298800.

The previous prime is 31125373493. The next prime is 31125373523. The reversal of 31125373505 is 50537352113.

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 24852891904 + 6272481601 = 157648^2 + 79199^2 .

It is not a de Polignac number, because 31125373505 - 2⁸ = 31125373249 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3112537346 + ... + 3112537355.

It is an arithmetic number, because the mean of its divisors is an integer number (9337612053).

Almost surely, 2^31125373505 is an apocalyptic number.

It is an amenable number.

31125373505 is a deficient number, since it is larger than the sum of its proper divisors (6225074707).

31125373505 is an equidigital number, since it uses as much as digits as its factorization.

31125373505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6225074706.

The product of its (nonzero) digits is 47250, while the sum is 35.

The spelling of 31125373505 in words is "thirty-one billion, one hundred twenty-five million, three hundred seventy-three thousand, five hundred five".