1631886461 has 2 divisors, whose sum is σ = 1631886462. Its totient is φ = 1631886460.

The previous prime is 1631886401. The next prime is 1631886479. The reversal of 1631886461 is 1646881361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1631352100 + 534361 = 40390^2 + 731^2 .

It is a cyclic number.

It is not a de Polignac number, because 1631886461 - 2⁶ = 1631886397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1631886401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 815943230 + 815943231.

It is an arithmetic number, because the mean of its divisors is an integer number (815943231).

Almost surely, 2^1631886461 is an apocalyptic number.

It is an amenable number.

1631886461 is a deficient number, since it is larger than the sum of its proper divisors (1).

1631886461 is an equidigital number, since it uses as much as digits as its factorization.

1631886461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 165888, while the sum is 44.

The square root of 1631886461 is about 40396.6144744829. The cubic root of 1631886461 is about 1177.3257597432.

The spelling of 1631886461 in words is "one billion, six hundred thirty-one million, eight hundred eighty-six thousand, four hundred sixty-one".