9001551 has 16 divisors (see below), whose sum is σ = 13686624. Its totient is φ = 5213184.

The previous prime is 9001523. The next prime is 9001561. The reversal of 9001551 is 1551009.

It is a happy number.

9001551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9001551 - 2⁵ = 9001519 is a prime.

9001551 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9001511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6126 + ... + 7451.

It is an arithmetic number, because the mean of its divisors is an integer number (855414).

Almost surely, 2^9001551 is an apocalyptic number.

9001551 is a deficient number, since it is larger than the sum of its proper divisors (4685073).

9001551 is a wasteful number, since it uses less digits than its factorization.

9001551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13610.

The product of its (nonzero) digits is 225, while the sum is 21.

The square root of 9001551 is about 3000.2584888639. The cubic root of 9001551 is about 208.0203305448.

The spelling of 9001551 in words is "nine million, one thousand, five hundred fifty-one".