1161603775 has 12 divisors (see below), whose sum is σ = 1440939024. Its totient is φ = 928928000.

The previous prime is 1161603767. The next prime is 1161603797. The reversal of 1161603775 is 5773061611.

It is not a de Polignac number, because 1161603775 - 2³ = 1161603767 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 72495 + ... + 87055.

It is an arithmetic number, because the mean of its divisors is an integer number (120078252).

Almost surely, 2^1161603775 is an apocalyptic number.

1161603775 is a deficient number, since it is larger than the sum of its proper divisors (279335249).

1161603775 is a wasteful number, since it uses less digits than its factorization.

1161603775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17762 (or 17757 counting only the distinct ones).

The product of its (nonzero) digits is 26460, while the sum is 37.

The square root of 1161603775 is about 34082.3088273080. The cubic root of 1161603775 is about 1051.2015798379.

The spelling of 1161603775 in words is "one billion, one hundred sixty-one million, six hundred three thousand, seven hundred seventy-five".