9115551 has 16 divisors (see below), whose sum is σ = 13708800. Its totient is φ = 5985144.

The previous prime is 9115549. The next prime is 9115633. The reversal of 9115551 is 1555119.

It is not a de Polignac number, because 9115551 - 2¹ = 9115549 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9115501) 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, 711 + ... + 4328.

It is an arithmetic number, because the mean of its divisors is an integer number (856800).

Almost surely, 2^9115551 is an apocalyptic number.

9115551 is a deficient number, since it is larger than the sum of its proper divisors (4593249).

9115551 is a wasteful number, since it uses less digits than its factorization.

9115551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5115 (or 5109 counting only the distinct ones).

The product of its digits is 1125, while the sum is 27.

The square root of 9115551 is about 3019.1970786949. The cubic root of 9115551 is about 208.8948060020.

It can be divided in two parts, 91 and 15551, that multiplied together give a palindrome (1415141).

The spelling of 9115551 in words is "nine million, one hundred fifteen thousand, five hundred fifty-one".