89810261 has 2 divisors, whose sum is σ = 89810262. Its totient is φ = 89810260.

The previous prime is 89810219. The next prime is 89810267. The reversal of 89810261 is 16201898.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69388900 + 20421361 = 8330^2 + 4519^2 .

It is a cyclic number.

It is not a de Polignac number, because 89810261 - 2¹⁸ = 89548117 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 (89810267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44905130 + 44905131.

It is an arithmetic number, because the mean of its divisors is an integer number (44905131).

Almost surely, 2^89810261 is an apocalyptic number.

It is an amenable number.

89810261 is a deficient number, since it is larger than the sum of its proper divisors (1).

89810261 is an equidigital number, since it uses as much as digits as its factorization.

89810261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 35.

The square root of 89810261 is about 9476.8275809999. The cubic root of 89810261 is about 447.8253281774.

The spelling of 89810261 in words is "eighty-nine million, eight hundred ten thousand, two hundred sixty-one".