31220131031 has 8 divisors (see below), whose sum is σ = 32615514624. Its totient is φ = 29849015160.

The previous prime is 31220131027. The next prime is 31220131039. The reversal of 31220131031 is 13013102213.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31220131031 - 2² = 31220131027 is a prime.

It is a super-2 number, since 2×31220131031² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31220131039) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6064301 + ... + 6069446.

It is an arithmetic number, because the mean of its divisors is an integer number (4076939328).

Almost surely, 2^31220131031 is an apocalyptic number.

31220131031 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

31220131031 is a deficient number, since it is larger than the sum of its proper divisors (1395383593).

31220131031 is a wasteful number, since it uses less digits than its factorization.

31220131031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12133861.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 31220131031 its reverse (13013102213), we get a palindrome (44233233244).

The spelling of 31220131031 in words is "thirty-one billion, two hundred twenty million, one hundred thirty-one thousand, thirty-one".