9161811551 has 8 divisors (see below), whose sum is σ = 9202410000. Its totient is φ = 9121262080.

The previous prime is 9161811539. The next prime is 9161811587. The reversal of 9161811551 is 1551181619.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9161811551 - 2⁶ = 9161811487 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 (9161511551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 391871 + ... + 414591.

It is an arithmetic number, because the mean of its divisors is an integer number (1150301250).

Almost surely, 2^9161811551 is an apocalyptic number.

9161811551 is a deficient number, since it is larger than the sum of its proper divisors (40598449).

9161811551 is a wasteful number, since it uses less digits than its factorization.

9161811551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24489.

The product of its digits is 10800, while the sum is 38.

The square root of 9161811551 is about 95717.3524027906. The cubic root of 9161811551 is about 2092.4758363433.

The spelling of 9161811551 in words is "nine billion, one hundred sixty-one million, eight hundred eleven thousand, five hundred fifty-one".