31404355217 has 2 divisors, whose sum is σ = 31404355218. Its totient is φ = 31404355216.

The previous prime is 31404355141. The next prime is 31404355243. The reversal of 31404355217 is 71255340413.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22910152321 + 8494202896 = 151361^2 + 92164^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31404355217 is a prime.

It is not a weakly prime, because it can be changed into another prime (31404355267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15702177608 + 15702177609.

It is an arithmetic number, because the mean of its divisors is an integer number (15702177609).

Almost surely, 2^31404355217 is an apocalyptic number.

It is an amenable number.

31404355217 is a deficient number, since it is larger than the sum of its proper divisors (1).

31404355217 is an equidigital number, since it uses as much as digits as its factorization.

31404355217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 50400, while the sum is 35.

The spelling of 31404355217 in words is "thirty-one billion, four hundred four million, three hundred fifty-five thousand, two hundred seventeen".