31231122102031 has 4 divisors (see below), whose sum is σ = 31371171977152. Its totient is φ = 31091072226912.

The previous prime is 31231122102017. The next prime is 31231122102067. The reversal of 31231122102031 is 13020122113213.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31231122102031 - 2¹⁷ = 31231121970959 is a prime.

It is a super-2 number, since 2×31231122102031² (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 = 31231122101993 and 31231122102011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31231122102331) 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, 70024937226 + ... + 70024937671.

It is an arithmetic number, because the mean of its divisors is an integer number (7842792994288).

Almost surely, 2^{31231122102031} is an apocalyptic number.

31231122102031 is a deficient number, since it is larger than the sum of its proper divisors (140049875121).

31231122102031 is a wasteful number, since it uses less digits than its factorization.

31231122102031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140049875120.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 31231122102031 its reverse (13020122113213), we get a palindrome (44251244215244).

The spelling of 31231122102031 in words is "thirty-one trillion, two hundred thirty-one billion, one hundred twenty-two million, one hundred two thousand, thirty-one".