90145871 has 4 divisors (see below), whose sum is σ = 90306552. Its totient is φ = 89985192.

The previous prime is 90145841. The next prime is 90145879. The reversal of 90145871 is 17854109.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90145871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90145879) 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, 79496 + ... + 80621.

It is an arithmetic number, because the mean of its divisors is an integer number (22576638).

Almost surely, 2^90145871 is an apocalyptic number.

90145871 is a deficient number, since it is larger than the sum of its proper divisors (160681).

90145871 is a wasteful number, since it uses less digits than its factorization.

90145871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160680.

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 90145871 is about 9494.5179445825. The cubic root of 90145871 is about 448.3824576690.

The spelling of 90145871 in words is "ninety million, one hundred forty-five thousand, eight hundred seventy-one".