90915571 has 8 divisors (see below), whose sum is σ = 92441088. Its totient is φ = 89397000.

The previous prime is 90915557. The next prime is 90915577. The reversal of 90915571 is 17551909.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 90915571 - 2⁷ = 90915443 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 90915571.

It is not an unprimeable number, because it can be changed into a prime (90915577) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29116 + ... + 32086.

It is an arithmetic number, because the mean of its divisors is an integer number (11555136).

Almost surely, 2^90915571 is an apocalyptic number.

90915571 is a deficient number, since it is larger than the sum of its proper divisors (1525517).

90915571 is a wasteful number, since it uses less digits than its factorization.

90915571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3473.

The product of its (nonzero) digits is 14175, while the sum is 37.

The square root of 90915571 is about 9534.9657052346. The cubic root of 90915571 is about 449.6549964675.

It can be divided in two parts, 909155 and 71, that added together give a triangular number (909226 = T₁₃₄₈).

The spelling of 90915571 in words is "ninety million, nine hundred fifteen thousand, five hundred seventy-one".