1526431561 has 2 divisors, whose sum is σ = 1526431562. Its totient is φ = 1526431560.

The previous prime is 1526431553. The next prime is 1526431567. The reversal of 1526431561 is 1651346251.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1040449536 + 485982025 = 32256^2 + 22045^2 .

It is a cyclic number.

It is not a de Polignac number, because 1526431561 - 2³ = 1526431553 is a prime.

It is not a weakly prime, because it can be changed into another prime (1526431567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 763215780 + 763215781.

It is an arithmetic number, because the mean of its divisors is an integer number (763215781).

Almost surely, 2^1526431561 is an apocalyptic number.

It is an amenable number.

1526431561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1526431561 is an equidigital number, since it uses as much as digits as its factorization.

1526431561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21600, while the sum is 34.

The square root of 1526431561 is about 39069.5733403886. The cubic root of 1526431561 is about 1151.3988173114.

The spelling of 1526431561 in words is "one billion, five hundred twenty-six million, four hundred thirty-one thousand, five hundred sixty-one".