90551601 has 40 divisors (see below), whose sum is σ = 159952320. Its totient is φ = 49950432.

The previous prime is 90551581. The next prime is 90551611. The reversal of 90551601 is 10615509.

90551601 is a `hidden beast` number, since 9 + 0 + 5 + 51 + 601 = 666.

It is not a de Polignac number, because 90551601 - 2⁹ = 90551089 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (90551611) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 13690 + ... + 19196.

It is an arithmetic number, because the mean of its divisors is an integer number (3998808).

Almost surely, 2^90551601 is an apocalyptic number.

It is an amenable number.

90551601 is a deficient number, since it is larger than the sum of its proper divisors (69400719).

90551601 is a wasteful number, since it uses less digits than its factorization.

90551601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5555 (or 5546 counting only the distinct ones).

The product of its (nonzero) digits is 1350, while the sum is 27.

The square root of 90551601 is about 9515.8604970859. The cubic root of 90551601 is about 449.0541466405.

The spelling of 90551601 in words is "ninety million, five hundred fifty-one thousand, six hundred one".