90155237 has 2 divisors, whose sum is σ = 90155238. Its totient is φ = 90155236.

The previous prime is 90155231. The next prime is 90155249. The reversal of 90155237 is 73255109.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77545636 + 12609601 = 8806^2 + 3551^2 .

It is an emirp because it is prime and its reverse (73255109) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90155237 - 2¹² = 90151141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90155231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45077618 + 45077619.

It is an arithmetic number, because the mean of its divisors is an integer number (45077619).

Almost surely, 2^90155237 is an apocalyptic number.

It is an amenable number.

90155237 is a deficient number, since it is larger than the sum of its proper divisors (1).

90155237 is an equidigital number, since it uses as much as digits as its factorization.

90155237 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9450, while the sum is 32.

The square root of 90155237 is about 9495.0111637638. The cubic root of 90155237 is about 448.3979858517.

The spelling of 90155237 in words is "ninety million, one hundred fifty-five thousand, two hundred thirty-seven".