1631432261 has 2 divisors, whose sum is σ = 1631432262. Its totient is φ = 1631432260.

The previous prime is 1631432191. The next prime is 1631432269. The reversal of 1631432261 is 1622341361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1559776036 + 71656225 = 39494^2 + 8465^2 .

It is a cyclic number.

It is not a de Polignac number, because 1631432261 - 2¹⁰ = 1631431237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1631432269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 815716130 + 815716131.

It is an arithmetic number, because the mean of its divisors is an integer number (815716131).

Almost surely, 2^1631432261 is an apocalyptic number.

It is an amenable number.

1631432261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1631432261 is an equidigital number, since it uses as much as digits as its factorization.

1631432261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 29.

The square root of 1631432261 is about 40390.9923250222. The cubic root of 1631432261 is about 1177.2165219599.

The spelling of 1631432261 in words is "one billion, six hundred thirty-one million, four hundred thirty-two thousand, two hundred sixty-one".