9115645551 has 16 divisors (see below), whose sum is σ = 12453809280. Its totient is φ = 5927675040.

The previous prime is 9115645549. The next prime is 9115645607. The reversal of 9115645551 is 1555465119.

It is a happy number.

It is not a de Polignac number, because 9115645551 - 2¹ = 9115645549 is a prime.

It is a super-2 number, since 2×9115645551² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9115645501) 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, 47521 + ... + 143141.

It is an arithmetic number, because the mean of its divisors is an integer number (778363080).

Almost surely, 2^9115645551 is an apocalyptic number.

9115645551 is a deficient number, since it is larger than the sum of its proper divisors (3338163729).

9115645551 is a wasteful number, since it uses less digits than its factorization.

9115645551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96406.

The product of its digits is 135000, while the sum is 42.

The square root of 9115645551 is about 95475.8898937318. The cubic root of 9115645551 is about 2088.9552825290.

The spelling of 9115645551 in words is "nine billion, one hundred fifteen million, six hundred forty-five thousand, five hundred fifty-one".