90612261 has 12 divisors (see below), whose sum is σ = 138583692. Its totient is φ = 56854656.

The previous prime is 90612257. The next prime is 90612281. The reversal of 90612261 is 16221609.

It can be written as a sum of positive squares in 2 ways, for example, as 70308225 + 20304036 = 8385^2 + 4506^2 .

It is not a de Polignac number, because 90612261 - 2² = 90612257 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90612281) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 295966 + ... + 296271.

It is an arithmetic number, because the mean of its divisors is an integer number (11548641).

Almost surely, 2^90612261 is an apocalyptic number.

It is an amenable number.

90612261 is a deficient number, since it is larger than the sum of its proper divisors (47971431).

90612261 is a wasteful number, since it uses less digits than its factorization.

90612261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 592260 (or 592257 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 90612261 is about 9519.0472737559. The cubic root of 90612261 is about 449.1543971936.

The spelling of 90612261 in words is "ninety million, six hundred twelve thousand, two hundred sixty-one".