31031013131 has 2 divisors, whose sum is σ = 31031013132. Its totient is φ = 31031013130.

The previous prime is 31031013103. The next prime is 31031013149. The reversal of 31031013131 is 13131013013.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31031013131 - 2¹⁰ = 31031012107 is a prime.

It is a super-2 number, since 2×31031013131² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31031013151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15515506565 + 15515506566.

It is an arithmetic number, because the mean of its divisors is an integer number (15515506566).

Almost surely, 2^31031013131 is an apocalyptic number.

31031013131 is a deficient number, since it is larger than the sum of its proper divisors (1).

31031013131 is an equidigital number, since it uses as much as digits as its factorization.

31031013131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81, while the sum is 17.

Adding to 31031013131 its reverse (13131013013), we get a palindrome (44162026144).

The spelling of 31031013131 in words is "thirty-one billion, thirty-one million, thirteen thousand, one hundred thirty-one".