1631552551 has 2 divisors, whose sum is σ = 1631552552. Its totient is φ = 1631552550.

The previous prime is 1631552521. The next prime is 1631552561. The reversal of 1631552551 is 1552551361.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1631552551 - 2⁷ = 1631552423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1631552521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 815776275 + 815776276.

It is an arithmetic number, because the mean of its divisors is an integer number (815776276).

Almost surely, 2^1631552551 is an apocalyptic number.

1631552551 is a deficient number, since it is larger than the sum of its proper divisors (1).

1631552551 is an equidigital number, since it uses as much as digits as its factorization.

1631552551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22500, while the sum is 34.

The square root of 1631552551 is about 40392.4813672050. The cubic root of 1631552551 is about 1177.2454543891.

The spelling of 1631552551 in words is "one billion, six hundred thirty-one million, five hundred fifty-two thousand, five hundred fifty-one".