31323220032157 has 2 divisors, whose sum is σ = 31323220032158. Its totient is φ = 31323220032156.

The previous prime is 31323220032131. The next prime is 31323220032191. The reversal of 31323220032157 is 75123002232313.

It is an a-pointer prime, because the next prime (31323220032191) can be obtained adding 31323220032157 to its sum of digits (34).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30892764631876 + 430455400281 = 5558126^2 + 656091^2 .

It is a cyclic number.

It is not a de Polignac number, because 31323220032157 - 2³¹ = 31321072548509 is a prime.

It is a super-2 number, since 2×31323220032157² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31323220038157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15661610016078 + 15661610016079.

It is an arithmetic number, because the mean of its divisors is an integer number (15661610016079).

Almost surely, 2^{31323220032157} is an apocalyptic number.

It is an amenable number.

31323220032157 is a deficient number, since it is larger than the sum of its proper divisors (1).

31323220032157 is an equidigital number, since it uses as much as digits as its factorization.

31323220032157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45360, while the sum is 34.

The spelling of 31323220032157 in words is "thirty-one trillion, three hundred twenty-three billion, two hundred twenty million, thirty-two thousand, one hundred fifty-seven".