31212032122157 has 2 divisors, whose sum is σ = 31212032122158. Its totient is φ = 31212032122156.

The previous prime is 31212032122099. The next prime is 31212032122189. The reversal of 31212032122157 is 75122123021213.

It is an a-pointer prime, because the next prime (31212032122189) can be obtained adding 31212032122157 to its sum of digits (32).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26758387468201 + 4453644653956 = 5172851^2 + 2110366^2 .

It is a cyclic number.

It is not a de Polignac number, because 31212032122157 - 2³⁴ = 31194852252973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31212032122657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15606016061078 + 15606016061079.

It is an arithmetic number, because the mean of its divisors is an integer number (15606016061079).

Almost surely, 2^{31212032122157} is an apocalyptic number.

It is an amenable number.

31212032122157 is a deficient number, since it is larger than the sum of its proper divisors (1).

31212032122157 is an equidigital number, since it uses as much as digits as its factorization.

31212032122157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 32.

The spelling of 31212032122157 in words is "thirty-one trillion, two hundred twelve billion, thirty-two million, one hundred twenty-two thousand, one hundred fifty-seven".