31501125401 has 4 divisors (see below), whose sum is σ = 31712542500. Its totient is φ = 31289708304.

The previous prime is 31501125391. The next prime is 31501125413. The reversal of 31501125401 is 10452110513.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10452110513 = 13 ⋅804008501.

It can be written as a sum of positive squares in 2 ways, for example, as 18618875401 + 12882250000 = 136451^2 + 113500^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31501125401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31501125451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105708326 + ... + 105708623.

It is an arithmetic number, because the mean of its divisors is an integer number (7928135625).

Almost surely, 2^31501125401 is an apocalyptic number.

It is an amenable number.

31501125401 is a deficient number, since it is larger than the sum of its proper divisors (211417099).

31501125401 is a wasteful number, since it uses less digits than its factorization.

31501125401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211417098.

The product of its (nonzero) digits is 600, while the sum is 23.

Adding to 31501125401 its reverse (10452110513), we get a palindrome (41953235914).

It can be divided in two parts, 3150112 and 5401, that added together give a palindrome (3155513).

The spelling of 31501125401 in words is "thirty-one billion, five hundred one million, one hundred twenty-five thousand, four hundred one".