1431431221361 has 2 divisors, whose sum is σ = 1431431221362. Its totient is φ = 1431431221360.

The previous prime is 1431431221331. The next prime is 1431431221453. The reversal of 1431431221361 is 1631221341341.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1431088230961 + 342990400 = 1196281^2 + 18520^2 .

It is a cyclic number.

It is not a de Polignac number, because 1431431221361 - 2³⁴ = 1414251352177 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1431431221321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 715715610680 + 715715610681.

It is an arithmetic number, because the mean of its divisors is an integer number (715715610681).

Almost surely, 2^{1431431221361} is an apocalyptic number.

It is an amenable number.

1431431221361 is a deficient number, since it is larger than the sum of its proper divisors (1).

1431431221361 is an equidigital number, since it uses as much as digits as its factorization.

1431431221361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 32.

The spelling of 1431431221361 in words is "one trillion, four hundred thirty-one billion, four hundred thirty-one million, two hundred twenty-one thousand, three hundred sixty-one".