31323220032131 has 2 divisors, whose sum is σ = 31323220032132. Its totient is φ = 31323220032130.

The previous prime is 31323220032101. The next prime is 31323220032157. The reversal of 31323220032131 is 13123002232313.

It is an a-pointer prime, because the next prime (31323220032157) can be obtained adding 31323220032131 to its sum of digits (26).

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31323220032131 is a prime.

It is a super-2 number, since 2×31323220032131² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31323220032131.

It is not a weakly prime, because it can be changed into another prime (31323220032101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15661610016065 + 15661610016066.

It is an arithmetic number, because the mean of its divisors is an integer number (15661610016066).

Almost surely, 2^{31323220032131} is an apocalyptic number.

31323220032131 is a deficient number, since it is larger than the sum of its proper divisors (1).

31323220032131 is an equidigital number, since it uses as much as digits as its factorization.

31323220032131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 26.

Adding to 31323220032131 its reverse (13123002232313), we get a palindrome (44446222264444).

The spelling of 31323220032131 in words is "thirty-one trillion, three hundred twenty-three billion, two hundred twenty million, thirty-two thousand, one hundred thirty-one".