31315437229 has 2 divisors, whose sum is σ = 31315437230. Its totient is φ = 31315437228.

The previous prime is 31315437211. The next prime is 31315437301. The reversal of 31315437229 is 92273451313.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27594193225 + 3721244004 = 166115^2 + 61002^2 .

It is a cyclic number.

It is not a de Polignac number, because 31315437229 - 2²⁷ = 31181219501 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31315437191 and 31315437200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31315434229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15657718614 + 15657718615.

It is an arithmetic number, because the mean of its divisors is an integer number (15657718615).

Almost surely, 2^31315437229 is an apocalyptic number.

It is an amenable number.

31315437229 is a deficient number, since it is larger than the sum of its proper divisors (1).

31315437229 is an equidigital number, since it uses as much as digits as its factorization.

31315437229 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 136080, while the sum is 40.

The spelling of 31315437229 in words is "thirty-one billion, three hundred fifteen million, four hundred thirty-seven thousand, two hundred twenty-nine".