90551647 has 4 divisors (see below), whose sum is σ = 90804240. Its totient is φ = 90299056.

The previous prime is 90551623. The next prime is 90551677. The reversal of 90551647 is 74615509.

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

It is a cyclic number.

It is not a de Polignac number, because 90551647 - 2⁷ = 90551519 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 (90551677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125758 + ... + 126475.

It is an arithmetic number, because the mean of its divisors is an integer number (22701060).

Almost surely, 2^90551647 is an apocalyptic number.

90551647 is a deficient number, since it is larger than the sum of its proper divisors (252593).

90551647 is a wasteful number, since it uses less digits than its factorization.

90551647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252592.

The product of its (nonzero) digits is 37800, while the sum is 37.

The square root of 90551647 is about 9515.8629141030. The cubic root of 90551647 is about 449.0542226800.

The spelling of 90551647 in words is "ninety million, five hundred fifty-one thousand, six hundred forty-seven".