1161131506 has 8 divisors (see below), whose sum is σ = 1748172780. Its totient is φ = 578407248.

The previous prime is 1161131497. The next prime is 1161131509. The reversal of 1161131506 is 6051311611.

It can be written as a sum of positive squares in 2 ways, for example, as 1160424225 + 707281 = 34065^2 + 841^2 .

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

It is not an unprimeable number, because it can be changed into a prime (1161131509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1078581 + ... + 1079656.

Almost surely, 2^1161131506 is an apocalyptic number.

1161131506 is a deficient number, since it is larger than the sum of its proper divisors (587041274).

1161131506 is a wasteful number, since it uses less digits than its factorization.

1161131506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2158508.

The product of its (nonzero) digits is 540, while the sum is 25.

The square root of 1161131506 is about 34075.3797631076. The cubic root of 1161131506 is about 1051.0590994658.

The spelling of 1161131506 in words is "one billion, one hundred sixty-one million, one hundred thirty-one thousand, five hundred six".