90217397 has 4 divisors (see below), whose sum is σ = 92315520. Its totient is φ = 88119276.

The previous prime is 90217373. The next prime is 90217411. The reversal of 90217397 is 79371209.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 79371209 = 107 ⋅741787.

It is a cyclic number.

It is not a de Polignac number, because 90217397 - 2⁶ = 90217333 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 90217397.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90217307) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1048997 + ... + 1049082.

It is an arithmetic number, because the mean of its divisors is an integer number (23078880).

Almost surely, 2^90217397 is an apocalyptic number.

It is an amenable number.

90217397 is a deficient number, since it is larger than the sum of its proper divisors (2098123).

90217397 is a wasteful number, since it uses less digits than its factorization.

90217397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2098122.

The product of its (nonzero) digits is 23814, while the sum is 38.

The square root of 90217397 is about 9498.2838976312. The cubic root of 90217397 is about 448.5010156049.

The spelling of 90217397 in words is "ninety million, two hundred seventeen thousand, three hundred ninety-seven".