1630411561 has 2 divisors, whose sum is σ = 1630411562. Its totient is φ = 1630411560.

The previous prime is 1630411547. The next prime is 1630411621. The reversal of 1630411561 is 1651140361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 907877161 + 722534400 = 30131^2 + 26880^2 .

It is a cyclic number.

It is not a de Polignac number, because 1630411561 - 2²⁷ = 1496193833 is a prime.

It is not a weakly prime, because it can be changed into another prime (1630411361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 815205780 + 815205781.

It is an arithmetic number, because the mean of its divisors is an integer number (815205781).

Almost surely, 2^1630411561 is an apocalyptic number.

It is an amenable number.

1630411561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1630411561 is an equidigital number, since it uses as much as digits as its factorization.

1630411561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 1630411561 is about 40378.3551051798. The cubic root of 1630411561 is about 1176.9709635817.

The spelling of 1630411561 in words is "one billion, six hundred thirty million, four hundred eleven thousand, five hundred sixty-one".