31301221431 has 16 divisors (see below), whose sum is σ = 41987939840. Its totient is φ = 20741253120.

The previous prime is 31301221381. The next prime is 31301221463. The reversal of 31301221431 is 13412210313.

It is not a de Polignac number, because 31301221431 - 2¹⁵ = 31301188663 is a prime.

It is a super-2 number, since 2×31301221431² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31301221398 and 31301221407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31301223431) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 454626 + ... + 518928.

It is an arithmetic number, because the mean of its divisors is an integer number (2624246240).

Almost surely, 2^31301221431 is an apocalyptic number.

31301221431 is a deficient number, since it is larger than the sum of its proper divisors (10686718409).

31301221431 is a wasteful number, since it uses less digits than its factorization.

31301221431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65286.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 31301221431 its reverse (13412210313), we get a palindrome (44713431744).

The spelling of 31301221431 in words is "thirty-one billion, three hundred one million, two hundred twenty-one thousand, four hundred thirty-one".