90177391 has 4 divisors (see below), whose sum is σ = 90604984. Its totient is φ = 89749800.

The previous prime is 90177389. The next prime is 90177413. The reversal of 90177391 is 19377109.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19377109 = 23 ⋅842483.

It is a cyclic number.

It is not a de Polignac number, because 90177391 - 2¹ = 90177389 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 90177391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90177331) 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, 213480 + ... + 213901.

It is an arithmetic number, because the mean of its divisors is an integer number (22651246).

Almost surely, 2^90177391 is an apocalyptic number.

90177391 is a deficient number, since it is larger than the sum of its proper divisors (427593).

90177391 is a wasteful number, since it uses less digits than its factorization.

90177391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427592.

The product of its (nonzero) digits is 11907, while the sum is 37.

The square root of 90177391 is about 9496.1777047399. The cubic root of 90177391 is about 448.4347113773.

The spelling of 90177391 in words is "ninety million, one hundred seventy-seven thousand, three hundred ninety-one".