90115071 has 4 divisors (see below), whose sum is σ = 120153432. Its totient is φ = 60076712.

The previous prime is 90115033. The next prime is 90115073. The reversal of 90115071 is 17051109.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17051109 = 3 ⋅5683703.

It is a cyclic number.

It is not a de Polignac number, because 90115071 - 2²² = 85920767 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90115073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15019176 + ... + 15019181.

It is an arithmetic number, because the mean of its divisors is an integer number (30038358).

Almost surely, 2^90115071 is an apocalyptic number.

90115071 is a deficient number, since it is larger than the sum of its proper divisors (30038361).

90115071 is a wasteful number, since it uses less digits than its factorization.

90115071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30038360.

The product of its (nonzero) digits is 315, while the sum is 24.

The square root of 90115071 is about 9492.8958173995. The cubic root of 90115071 is about 448.3313858056.

The spelling of 90115071 in words is "ninety million, one hundred fifteen thousand, seventy-one".