90205957 has 2 divisors, whose sum is σ = 90205958. Its totient is φ = 90205956.

The previous prime is 90205949. The next prime is 90205981. The reversal of 90205957 is 75950209.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90041121 + 164836 = 9489^2 + 406^2 .

It is a cyclic number.

It is not a de Polignac number, because 90205957 - 2³ = 90205949 is a prime.

It is a super-2 number, since 2×90205957² = 16274229356571698, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90205937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45102978 + 45102979.

It is an arithmetic number, because the mean of its divisors is an integer number (45102979).

Almost surely, 2^90205957 is an apocalyptic number.

It is an amenable number.

90205957 is a deficient number, since it is larger than the sum of its proper divisors (1).

90205957 is an equidigital number, since it uses as much as digits as its factorization.

90205957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28350, while the sum is 37.

The square root of 90205957 is about 9497.6816644906. The cubic root of 90205957 is about 448.4820574413.

The spelling of 90205957 in words is "ninety million, two hundred five thousand, nine hundred fifty-seven".