90249997 has 2 divisors, whose sum is σ = 90249998. Its totient is φ = 90249996.

The previous prime is 90249989. The next prime is 90250007. The reversal of 90249997 is 79994209.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52722121 + 37527876 = 7261^2 + 6126^2 .

It is a cyclic number.

It is not a de Polignac number, because 90249997 - 2³ = 90249989 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 90249997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90249947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45124998 + 45124999.

It is an arithmetic number, because the mean of its divisors is an integer number (45124999).

Almost surely, 2^90249997 is an apocalyptic number.

It is an amenable number.

90249997 is a deficient number, since it is larger than the sum of its proper divisors (1).

90249997 is an equidigital number, since it uses as much as digits as its factorization.

90249997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 367416, while the sum is 49.

The square root of 90249997 is about 9499.9998421053. Note that the first 3 decimals coincide. The cubic root of 90249997 is about 448.5550309531. Note that the first 3 decimals are identical.

The spelling of 90249997 in words is "ninety million, two hundred forty-nine thousand, nine hundred ninety-seven".