90345287 has 2 divisors, whose sum is σ = 90345288. Its totient is φ = 90345286.

The previous prime is 90345257. The next prime is 90345289. The reversal of 90345287 is 78254309.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 90345287 - 2¹⁶ = 90279751 is a prime.

It is a super-2 number, since 2×90345287² = 16324541766224738, which contains 22 as substring.

Together with 90345289, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 90345287.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90345289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45172643 + 45172644.

It is an arithmetic number, because the mean of its divisors is an integer number (45172644).

Almost surely, 2^90345287 is an apocalyptic number.

90345287 is a deficient number, since it is larger than the sum of its proper divisors (1).

90345287 is an equidigital number, since it uses as much as digits as its factorization.

90345287 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 90345287 is about 9505.0137822099. The cubic root of 90345287 is about 448.7128436064.

The spelling of 90345287 in words is "ninety million, three hundred forty-five thousand, two hundred eighty-seven".