90215387 has 2 divisors, whose sum is σ = 90215388. Its totient is φ = 90215386.

The previous prime is 90215383. The next prime is 90215399. The reversal of 90215387 is 78351209.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 90215387 - 2² = 90215383 is a prime.

It is not a weakly prime, because it can be changed into another prime (90215383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45107693 + 45107694.

It is an arithmetic number, because the mean of its divisors is an integer number (45107694).

Almost surely, 2^90215387 is an apocalyptic number.

90215387 is a deficient number, since it is larger than the sum of its proper divisors (1).

90215387 is an equidigital number, since it uses as much as digits as its factorization.

90215387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 90215387 is about 9498.1780884546. The cubic root of 90215387 is about 448.4976847848.

The spelling of 90215387 in words is "ninety million, two hundred fifteen thousand, three hundred eighty-seven".