31131132210131 has 8 divisors (see below), whose sum is σ = 32718362288640. Its totient is φ = 29563377347592.

The previous prime is 31131132210121. The next prime is 31131132210151. The reversal of 31131132210131 is 13101223113113.

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

It is a de Polignac number, because none of the positive numbers 2^k-31131132210131 is a prime.

It is a super-2 number, since 2×31131132210131² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31131132210097 and 31131132210106.

It is not an unprimeable number, because it can be changed into a prime (31131132210121) 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, 4868800715 + ... + 4868807108.

It is an arithmetic number, because the mean of its divisors is an integer number (4089795286080).

Almost surely, 2^{31131132210131} is an apocalyptic number.

31131132210131 is a deficient number, since it is larger than the sum of its proper divisors (1587230078509).

31131132210131 is a wasteful number, since it uses less digits than its factorization.

31131132210131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9737607985.

The product of its (nonzero) digits is 324, while the sum is 23.

Adding to 31131132210131 its reverse (13101223113113), we get a palindrome (44232355323244).

The spelling of 31131132210131 in words is "thirty-one trillion, one hundred thirty-one billion, one hundred thirty-two million, two hundred ten thousand, one hundred thirty-one".