31020131 has 4 divisors (see below), whose sum is σ = 31264512. Its totient is φ = 30775752.

The previous prime is 31020127. The next prime is 31020133. The reversal of 31020131 is 13102013.

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 31020131 - 2² = 31020127 is a prime.

It is a super-2 number, since 2×31020131² = 1924497054514322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31020133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122000 + ... + 122253.

It is an arithmetic number, because the mean of its divisors is an integer number (7816128).

Almost surely, 2^31020131 is an apocalyptic number.

31020131 is a deficient number, since it is larger than the sum of its proper divisors (244381).

31020131 is a wasteful number, since it uses less digits than its factorization.

31020131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244380.

The product of its (nonzero) digits is 18, while the sum is 11.

The square root of 31020131 is about 5569.5718865995. The cubic root of 31020131 is about 314.2060495939.

Adding to 31020131 its reverse (13102013), we get a palindrome (44122144).

The spelling of 31020131 in words is "thirty-one million, twenty thousand, one hundred thirty-one".