1631413649 has 2 divisors, whose sum is σ = 1631413650. Its totient is φ = 1631413648.

The previous prime is 1631413643. The next prime is 1631413717. The reversal of 1631413649 is 9463141361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1341903424 + 289510225 = 36632^2 + 17015^2 .

It is a cyclic number.

It is not a de Polignac number, because 1631413649 - 2²⁰ = 1630365073 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1631413643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 815706824 + 815706825.

It is an arithmetic number, because the mean of its divisors is an integer number (815706825).

Almost surely, 2^1631413649 is an apocalyptic number.

It is an amenable number.

1631413649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1631413649 is an equidigital number, since it uses as much as digits as its factorization.

1631413649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 38.

The square root of 1631413649 is about 40390.7619264604. The cubic root of 1631413649 is about 1177.2120452315.

The spelling of 1631413649 in words is "one billion, six hundred thirty-one million, four hundred thirteen thousand, six hundred forty-nine".