31774361321 has 2 divisors, whose sum is σ = 31774361322. Its totient is φ = 31774361320.

The previous prime is 31774361293. The next prime is 31774361347. The reversal of 31774361321 is 12316347713.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31174846096 + 599515225 = 176564^2 + 24485^2 .

It is a cyclic number.

It is not a de Polignac number, because 31774361321 - 2¹⁰ = 31774360297 is a prime.

It is a super-2 number, since 2×31774361321² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31774361221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15887180660 + 15887180661.

It is an arithmetic number, because the mean of its divisors is an integer number (15887180661).

Almost surely, 2^31774361321 is an apocalyptic number.

It is an amenable number.

31774361321 is a deficient number, since it is larger than the sum of its proper divisors (1).

31774361321 is an equidigital number, since it uses as much as digits as its factorization.

31774361321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63504, while the sum is 38.

The spelling of 31774361321 in words is "thirty-one billion, seven hundred seventy-four million, three hundred sixty-one thousand, three hundred twenty-one".