31220134231 has 16 divisors (see below), whose sum is σ = 36683206560. Its totient is φ = 26195137920.

The previous prime is 31220134229. The next prime is 31220134241. The reversal of 31220134231 is 13243102213.

It is a cyclic number.

It is not a de Polignac number, because 31220134231 - 2¹ = 31220134229 is a prime.

It is a super-2 number, since 2×31220134231² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31220134241) 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, 1846725 + ... + 1863553.

It is an arithmetic number, because the mean of its divisors is an integer number (2292700410).

Almost surely, 2^31220134231 is an apocalyptic number.

31220134231 is a deficient number, since it is larger than the sum of its proper divisors (5463072329).

31220134231 is a wasteful number, since it uses less digits than its factorization.

31220134231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29826.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 31220134231 its reverse (13243102213), we get a palindrome (44463236444).

The spelling of 31220134231 in words is "thirty-one billion, two hundred twenty million, one hundred thirty-four thousand, two hundred thirty-one".