9161398511 has 4 divisors (see below), whose sum is σ = 9643577400. Its totient is φ = 8679219624.

The previous prime is 9161398487. The next prime is 9161398541. The reversal of 9161398511 is 1158931619.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9161398511 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 (9161398541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 241089416 + ... + 241089453.

It is an arithmetic number, because the mean of its divisors is an integer number (2410894350).

Almost surely, 2^9161398511 is an apocalyptic number.

9161398511 is a deficient number, since it is larger than the sum of its proper divisors (482178889).

9161398511 is a wasteful number, since it uses less digits than its factorization.

9161398511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 482178888.

The product of its digits is 58320, while the sum is 44.

The square root of 9161398511 is about 95715.1947759602. The cubic root of 9161398511 is about 2092.4443909898. Note that the first 3 decimals are identical.

The spelling of 9161398511 in words is "nine billion, one hundred sixty-one million, three hundred ninety-eight thousand, five hundred eleven".