90212207 has 2 divisors, whose sum is σ = 90212208. Its totient is φ = 90212206.

The previous prime is 90212191. The next prime is 90212249. The reversal of 90212207 is 70221209.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 90212207 - 2⁴ = 90212191 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90217207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45106103 + 45106104.

It is an arithmetic number, because the mean of its divisors is an integer number (45106104).

Almost surely, 2^90212207 is an apocalyptic number.

90212207 is a deficient number, since it is larger than the sum of its proper divisors (1).

90212207 is an equidigital number, since it uses as much as digits as its factorization.

90212207 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 90212207 is about 9498.0106864543. The cubic root of 90212207 is about 448.4924150282.

The spelling of 90212207 in words is "ninety million, two hundred twelve thousand, two hundred seven".