1531791641 has 2 divisors, whose sum is σ = 1531791642. Its totient is φ = 1531791640.

The previous prime is 1531791619. The next prime is 1531791649. The reversal of 1531791641 is 1461971351.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1201315600 + 330476041 = 34660^2 + 18179^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1531791641 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1531791595 and 1531791604.

It is not a weakly prime, because it can be changed into another prime (1531791649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 765895820 + 765895821.

It is an arithmetic number, because the mean of its divisors is an integer number (765895821).

Almost surely, 2^1531791641 is an apocalyptic number.

It is an amenable number.

1531791641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1531791641 is an equidigital number, since it uses as much as digits as its factorization.

1531791641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22680, while the sum is 38.

The square root of 1531791641 is about 39138.1098291678. The cubic root of 1531791641 is about 1152.7449591066.

The spelling of 1531791641 in words is "one billion, five hundred thirty-one million, seven hundred ninety-one thousand, six hundred forty-one".