31320251621189 has 2 divisors, whose sum is σ = 31320251621190. Its totient is φ = 31320251621188.

The previous prime is 31320251621161. The next prime is 31320251621221. The reversal of 31320251621189 is 98112615202313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24233634936289 + 7086616684900 = 4922767^2 + 2662070^2 .

It is a cyclic number.

It is not a de Polignac number, because 31320251621189 - 2¹⁶ = 31320251555653 is a prime.

It is a super-2 number, since 2×31320251621189² (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 (31320251621129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15660125810594 + 15660125810595.

It is an arithmetic number, because the mean of its divisors is an integer number (15660125810595).

Almost surely, 2^{31320251621189} is an apocalyptic number.

It is an amenable number.

31320251621189 is a deficient number, since it is larger than the sum of its proper divisors (1).

31320251621189 is an equidigital number, since it uses as much as digits as its factorization.

31320251621189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 155520, while the sum is 44.

The spelling of 31320251621189 in words is "thirty-one trillion, three hundred twenty billion, two hundred fifty-one million, six hundred twenty-one thousand, one hundred eighty-nine".