31212131437 has 2 divisors, whose sum is σ = 31212131438. Its totient is φ = 31212131436.

The previous prime is 31212131417. The next prime is 31212131471. The reversal of 31212131437 is 73413121213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24010742116 + 7201389321 = 154954^2 + 84861^2 .

It is a cyclic number.

It is not a de Polignac number, because 31212131437 - 2¹⁵ = 31212098669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31212131417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15606065718 + 15606065719.

It is an arithmetic number, because the mean of its divisors is an integer number (15606065719).

Almost surely, 2^31212131437 is an apocalyptic number.

It is an amenable number.

31212131437 is a deficient number, since it is larger than the sum of its proper divisors (1).

31212131437 is an equidigital number, since it uses as much as digits as its factorization.

31212131437 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 28.

The spelling of 31212131437 in words is "thirty-one billion, two hundred twelve million, one hundred thirty-one thousand, four hundred thirty-seven".