1161565506 has 24 divisors (see below), whose sum is σ = 2578110444. Its totient is φ = 377744640.

The previous prime is 1161565499. The next prime is 1161565529. The reversal of 1161565506 is 6055651611.

It can be written as a sum of positive squares in 2 ways, for example, as 1160015481 + 1550025 = 34059^2 + 1245^2 .

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, 786231 + ... + 787706.

Almost surely, 2^1161565506 is an apocalyptic number.

1161565506 is an abundant number, since it is smaller than the sum of its proper divisors (1416544938).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1161565506 is a wasteful number, since it uses less digits than its factorization.

1161565506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1573986 (or 1573983 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The square root of 1161565506 is about 34081.7474023853. The cubic root of 1161565506 is about 1051.1900357767.

The spelling of 1161565506 in words is "one billion, one hundred sixty-one million, five hundred sixty-five thousand, five hundred six".