31340221457 has 2 divisors, whose sum is σ = 31340221458. Its totient is φ = 31340221456.

The previous prime is 31340221447. The next prime is 31340221469. The reversal of 31340221457 is 75412204313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29899943056 + 1440278401 = 172916^2 + 37951^2 .

It is a cyclic number.

It is not a de Polignac number, because 31340221457 - 2¹⁴ = 31340205073 is a prime.

It is not a weakly prime, because it can be changed into another prime (31340221417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15670110728 + 15670110729.

It is an arithmetic number, because the mean of its divisors is an integer number (15670110729).

Almost surely, 2^31340221457 is an apocalyptic number.

It is an amenable number.

31340221457 is a deficient number, since it is larger than the sum of its proper divisors (1).

31340221457 is an equidigital number, since it uses as much as digits as its factorization.

31340221457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20160, while the sum is 32.

The spelling of 31340221457 in words is "thirty-one billion, three hundred forty million, two hundred twenty-one thousand, four hundred fifty-seven".