1431631578781 has 2 divisors, whose sum is σ = 1431631578782. Its totient is φ = 1431631578780.

The previous prime is 1431631578749. The next prime is 1431631578841. The reversal of 1431631578781 is 1878751361341.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1352731824900 + 78899753881 = 1163070^2 + 280891^2 .

It is a cyclic number.

It is not a de Polignac number, because 1431631578781 - 2⁵ = 1431631578749 is a prime.

It is a super-2 number, since 2×1431631578781² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1431631578731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 715815789390 + 715815789391.

It is an arithmetic number, because the mean of its divisors is an integer number (715815789391).

Almost surely, 2^{1431631578781} is an apocalyptic number.

It is an amenable number.

1431631578781 is a deficient number, since it is larger than the sum of its proper divisors (1).

1431631578781 is an equidigital number, since it uses as much as digits as its factorization.

1431631578781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3386880, while the sum is 55.

The spelling of 1431631578781 in words is "one trillion, four hundred thirty-one billion, six hundred thirty-one million, five hundred seventy-eight thousand, seven hundred eighty-one".