31121401305 has 32 divisors (see below), whose sum is σ = 52737609600. Its totient is φ = 15617487872.

The previous prime is 31121401273. The next prime is 31121401321. The reversal of 31121401305 is 50310412113.

It is a cyclic number.

It is not a de Polignac number, because 31121401305 - 2⁵ = 31121401273 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1063966 + ... + 1092824.

It is an arithmetic number, because the mean of its divisors is an integer number (1648050300).

Almost surely, 2^31121401305 is an apocalyptic number.

It is an amenable number.

31121401305 is a deficient number, since it is larger than the sum of its proper divisors (21616208295).

31121401305 is a wasteful number, since it uses less digits than its factorization.

31121401305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33113.

The product of its (nonzero) digits is 360, while the sum is 21.

Adding to 31121401305 its reverse (50310412113), we get a palindrome (81431813418).

The spelling of 31121401305 in words is "thirty-one billion, one hundred twenty-one million, four hundred one thousand, three hundred five".