89731400261 has 2 divisors, whose sum is σ = 89731400262. Its totient is φ = 89731400260.

The previous prime is 89731400257. The next prime is 89731400327. The reversal of 89731400261 is 16200413798.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86726716036 + 3004684225 = 294494^2 + 54815^2 .

It is a cyclic number.

It is not a de Polignac number, because 89731400261 - 2² = 89731400257 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (89731400761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44865700130 + 44865700131.

It is an arithmetic number, because the mean of its divisors is an integer number (44865700131).

Almost surely, 2^89731400261 is an apocalyptic number.

It is an amenable number.

89731400261 is a deficient number, since it is larger than the sum of its proper divisors (1).

89731400261 is an equidigital number, since it uses as much as digits as its factorization.

89731400261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 41.

The spelling of 89731400261 in words is "eighty-nine billion, seven hundred thirty-one million, four hundred thousand, two hundred sixty-one".