90971315 has 4 divisors (see below), whose sum is σ = 109165584. Its totient is φ = 72777048.

The previous prime is 90971299. The next prime is 90971317. The reversal of 90971315 is 51317909.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 90971315 - 2⁴ = 90971299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90971317) 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, 9097127 + ... + 9097136.

It is an arithmetic number, because the mean of its divisors is an integer number (27291396).

Almost surely, 2^90971315 is an apocalyptic number.

90971315 is a deficient number, since it is larger than the sum of its proper divisors (18194269).

90971315 is a wasteful number, since it uses less digits than its factorization.

90971315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18194268.

The product of its (nonzero) digits is 8505, while the sum is 35.

The square root of 90971315 is about 9537.8883931403. Note that the first 3 decimals coincide. The cubic root of 90971315 is about 449.7468782236.

The spelling of 90971315 in words is "ninety million, nine hundred seventy-one thousand, three hundred fifteen".