90115261 has 2 divisors, whose sum is σ = 90115262. Its totient is φ = 90115260.

The previous prime is 90115247. The next prime is 90115273. The reversal of 90115261 is 16251109.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67732900 + 22382361 = 8230^2 + 4731^2 .

It is a cyclic number.

It is not a de Polignac number, because 90115261 - 2¹¹ = 90113213 is a prime.

It is equal to p_5223292 and since 90115261 and 5223292 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90115241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45057630 + 45057631.

It is an arithmetic number, because the mean of its divisors is an integer number (45057631).

Almost surely, 2^90115261 is an apocalyptic number.

It is an amenable number.

90115261 is a deficient number, since it is larger than the sum of its proper divisors (1).

90115261 is an equidigital number, since it uses as much as digits as its factorization.

90115261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 540, while the sum is 25.

The square root of 90115261 is about 9492.9058248779. The cubic root of 90115261 is about 448.3317008949.

The spelling of 90115261 in words is "ninety million, one hundred fifteen thousand, two hundred sixty-one".