31240020131 has 8 divisors (see below), whose sum is σ = 33083051040. Its totient is φ = 29397587328.

The previous prime is 31240020127. The next prime is 31240020139. The reversal of 31240020131 is 13102004213.

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 31240020131 - 2² = 31240020127 is a prime.

It is a super-2 number, since 2×31240020131² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31240020139) 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, 39671 + ... + 253088.

It is an arithmetic number, because the mean of its divisors is an integer number (4135381380).

Almost surely, 2^31240020131 is an apocalyptic number.

31240020131 is a deficient number, since it is larger than the sum of its proper divisors (1843030909).

31240020131 is a wasteful number, since it uses less digits than its factorization.

31240020131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299053.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 31240020131 its reverse (13102004213), we get a palindrome (44342024344).

The spelling of 31240020131 in words is "thirty-one billion, two hundred forty million, twenty thousand, one hundred thirty-one".