31125615421 has 4 divisors (see below), whose sum is σ = 32478903072. Its totient is φ = 29772327772.

The previous prime is 31125615419. The next prime is 31125615427. The reversal of 31125615421 is 12451652113.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31125615421 - 2¹ = 31125615419 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31125615427) 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, 676643791 + ... + 676643836.

It is an arithmetic number, because the mean of its divisors is an integer number (8119725768).

Almost surely, 2^31125615421 is an apocalyptic number.

It is an amenable number.

31125615421 is a deficient number, since it is larger than the sum of its proper divisors (1353287651).

31125615421 is a wasteful number, since it uses less digits than its factorization.

31125615421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1353287650.

The product of its digits is 7200, while the sum is 31.

The spelling of 31125615421 in words is "thirty-one billion, one hundred twenty-five million, six hundred fifteen thousand, four hundred twenty-one".