90118261 has 2 divisors, whose sum is σ = 90118262. Its totient is φ = 90118260.

The previous prime is 90118253. The next prime is 90118277. The reversal of 90118261 is 16281109.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72352036 + 17766225 = 8506^2 + 4215^2 .

It is a cyclic number.

It is not a de Polignac number, because 90118261 - 2³ = 90118253 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90118211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45059130 + 45059131.

It is an arithmetic number, because the mean of its divisors is an integer number (45059131).

Almost surely, 2^90118261 is an apocalyptic number.

It is an amenable number.

90118261 is a deficient number, since it is larger than the sum of its proper divisors (1).

90118261 is an equidigital number, since it uses as much as digits as its factorization.

90118261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 28.

The square root of 90118261 is about 9493.0638362965. The cubic root of 90118261 is about 448.3366759316.

The spelling of 90118261 in words is "ninety million, one hundred eighteen thousand, two hundred sixty-one".