1161427972 has 18 divisors (see below), whose sum is σ = 2145105438. Its totient is φ = 550149408.

The previous prime is 1161427957. The next prime is 1161427999. The reversal of 1161427972 is 2797241611.

It can be written as a sum of positive squares in only one way, i.e., 1148938816 + 12489156 = 33896^2 + 3534^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 400713 + ... + 403600.

Almost surely, 2^1161427972 is an apocalyptic number.

It is an amenable number.

1161427972 is a deficient number, since it is larger than the sum of its proper divisors (983677466).

1161427972 is a wasteful number, since it uses less digits than its factorization.

1161427972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 804355 (or 804334 counting only the distinct ones).

The product of its digits is 42336, while the sum is 40.

The square root of 1161427972 is about 34079.7296350778. The cubic root of 1161427972 is about 1051.1485457715.

The spelling of 1161427972 in words is "one billion, one hundred sixty-one million, four hundred twenty-seven thousand, nine hundred seventy-two".