90197207 has 2 divisors, whose sum is σ = 90197208. Its totient is φ = 90197206.

The previous prime is 90197147. The next prime is 90197213. The reversal of 90197207 is 70279109.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 90197207 - 2¹⁸ = 89935063 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90197227) 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, 45098603 + 45098604.

It is an arithmetic number, because the mean of its divisors is an integer number (45098604).

Almost surely, 2^90197207 is an apocalyptic number.

90197207 is a deficient number, since it is larger than the sum of its proper divisors (1).

90197207 is an equidigital number, since it uses as much as digits as its factorization.

90197207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7938, while the sum is 35.

The square root of 90197207 is about 9497.2210145916. The cubic root of 90197207 is about 448.4675560158.

The spelling of 90197207 in words is "ninety million, one hundred ninety-seven thousand, two hundred seven".