31301431021231 has 12 divisors (see below), whose sum is σ = 36412019878872. Its totient is φ = 26829686652048.

The previous prime is 31301431021177. The next prime is 31301431021271. The reversal of 31301431021231 is 13212013410313.

It is not a de Polignac number, because 31301431021231 - 2⁹ = 31301431020719 is a prime.

It is a super-2 number, since 2×31301431021231² (a number of 28 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 = 31301431021196 and 31301431021205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31301431021271) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11940361 + ... + 14323933.

It is an arithmetic number, because the mean of its divisors is an integer number (3034334989906).

Almost surely, 2^{31301431021231} is an apocalyptic number.

31301431021231 is a deficient number, since it is larger than the sum of its proper divisors (5110588857641).

31301431021231 is a wasteful number, since it uses less digits than its factorization.

31301431021231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2651590 (or 2651583 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 25.

Adding to 31301431021231 its reverse (13212013410313), we get a palindrome (44513444431544).

The spelling of 31301431021231 in words is "thirty-one trillion, three hundred one billion, four hundred thirty-one million, twenty-one thousand, two hundred thirty-one".