90612281 has 2 divisors, whose sum is σ = 90612282. Its totient is φ = 90612280.

The previous prime is 90612257. The next prime is 90612283. The reversal of 90612281 is 18221609.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78943225 + 11669056 = 8885^2 + 3416^2 .

It is a cyclic number.

It is not a de Polignac number, because 90612281 - 2⁶ = 90612217 is a prime.

It is a super-2 number, since 2×90612281² = 16421170936045922, which contains 22 as substring.

Together with 90612283, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (90612283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45306140 + 45306141.

It is an arithmetic number, because the mean of its divisors is an integer number (45306141).

Almost surely, 2^90612281 is an apocalyptic number.

It is an amenable number.

90612281 is a deficient number, since it is larger than the sum of its proper divisors (1).

90612281 is an equidigital number, since it uses as much as digits as its factorization.

90612281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 90612281 is about 9519.0483242812. The cubic root of 90612281 is about 449.1544302395.

The spelling of 90612281 in words is "ninety million, six hundred twelve thousand, two hundred eighty-one".