90518957 has 2 divisors, whose sum is σ = 90518958. Its totient is φ = 90518956.

The previous prime is 90518951. The next prime is 90518959. The reversal of 90518957 is 75981509.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83649316 + 6869641 = 9146^2 + 2621^2 .

It is an emirp because it is prime and its reverse (75981509) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90518957 - 2⁶ = 90518893 is a prime.

Together with 90518959, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90518951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45259478 + 45259479.

It is an arithmetic number, because the mean of its divisors is an integer number (45259479).

Almost surely, 2^90518957 is an apocalyptic number.

It is an amenable number.

90518957 is a deficient number, since it is larger than the sum of its proper divisors (1).

90518957 is an equidigital number, since it uses as much as digits as its factorization.

90518957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 113400, while the sum is 44.

The square root of 90518957 is about 9514.1451008485. The cubic root of 90518957 is about 449.0001785705. Note that the first 3 decimals are identical.

The spelling of 90518957 in words is "ninety million, five hundred eighteen thousand, nine hundred fifty-seven".