1631859641 has 2 divisors, whose sum is σ = 1631859642. Its totient is φ = 1631859640.

The previous prime is 1631859577. The next prime is 1631859653. The reversal of 1631859641 is 1469581361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1488339241 + 143520400 = 38579^2 + 11980^2 .

It is a cyclic number.

It is not a de Polignac number, because 1631859641 - 2⁶ = 1631859577 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1631859592 and 1631859601.

It is not a weakly prime, because it can be changed into another prime (1631859661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 815929820 + 815929821.

It is an arithmetic number, because the mean of its divisors is an integer number (815929821).

Almost surely, 2^1631859641 is an apocalyptic number.

It is an amenable number.

1631859641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1631859641 is an equidigital number, since it uses as much as digits as its factorization.

1631859641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 44.

The square root of 1631859641 is about 40396.2825146077. The cubic root of 1631859641 is about 1177.3193099379.

The spelling of 1631859641 in words is "one billion, six hundred thirty-one million, eight hundred fifty-nine thousand, six hundred forty-one".