90995551 has 4 divisors (see below), whose sum is σ = 91016352. Its totient is φ = 90974752.

The previous prime is 90995519. The next prime is 90995561. The reversal of 90995551 is 15559909.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15559909 = 2663 ⋅5843.

It is a cyclic number.

It is not a de Polignac number, because 90995551 - 2⁵ = 90995519 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 90995498 and 90995507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90995501) 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, 1015 + ... + 13528.

It is an arithmetic number, because the mean of its divisors is an integer number (22754088).

Almost surely, 2^90995551 is an apocalyptic number.

90995551 is a deficient number, since it is larger than the sum of its proper divisors (20801).

90995551 is a wasteful number, since it uses less digits than its factorization.

90995551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20800.

The product of its (nonzero) digits is 91125, while the sum is 43.

The square root of 90995551 is about 9539.1588203573. The cubic root of 90995551 is about 449.7868142464.

The spelling of 90995551 in words is "ninety million, nine hundred ninety-five thousand, five hundred fifty-one".