1630621651 has 2 divisors, whose sum is σ = 1630621652. Its totient is φ = 1630621650.

The previous prime is 1630621633. The next prime is 1630621673. The reversal of 1630621651 is 1561260361.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1630621651 - 2¹¹ = 1630619603 is a prime.

It is not a weakly prime, because it can be changed into another prime (1630621621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 815310825 + 815310826.

It is an arithmetic number, because the mean of its divisors is an integer number (815310826).

Almost surely, 2^1630621651 is an apocalyptic number.

1630621651 is a deficient number, since it is larger than the sum of its proper divisors (1).

1630621651 is an equidigital number, since it uses as much as digits as its factorization.

1630621651 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 1630621651 is about 40380.9565389430. The cubic root of 1630621651 is about 1177.0215150734.

The spelling of 1630621651 in words is "one billion, six hundred thirty million, six hundred twenty-one thousand, six hundred fifty-one".