1631552521 has 2 divisors, whose sum is σ = 1631552522. Its totient is φ = 1631552520.

The previous prime is 1631552471. The next prime is 1631552551. The reversal of 1631552521 is 1252551361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1584438025 + 47114496 = 39805^2 + 6864^2 .

It is a cyclic number.

It is not a de Polignac number, because 1631552521 - 2¹³ = 1631544329 is a prime.

It is not a weakly prime, because it can be changed into another prime (1631552551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 815776260 + 815776261.

It is an arithmetic number, because the mean of its divisors is an integer number (815776261).

Almost surely, 2^1631552521 is an apocalyptic number.

It is an amenable number.

1631552521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1631552521 is an equidigital number, since it uses as much as digits as its factorization.

1631552521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9000, while the sum is 31.

The square root of 1631552521 is about 40392.4809958487. The cubic root of 1631552521 is about 1177.2454471736.

The spelling of 1631552521 in words is "one billion, six hundred thirty-one million, five hundred fifty-two thousand, five hundred twenty-one".