1161131544 has 32 divisors (see below), whose sum is σ = 3225366000. Its totient is φ = 387043776.

The previous prime is 1161131527. The next prime is 1161131561. The reversal of 1161131544 is 4451311611.

1161131544 is a `hidden beast` number, since 1 + 1 + 6 + 113 + 1 + 544 = 666.

It is an interprime number because it is at equal distance from previous prime (1161131527) and next prime (1161131561).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2687589 + ... + 2688020.

Almost surely, 2^1161131544 is an apocalyptic number.

It is an amenable number.

1161131544 is an abundant number, since it is smaller than the sum of its proper divisors (2064234456).

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

1161131544 is a wasteful number, since it uses less digits than its factorization.

1161131544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5375624 (or 5375614 counting only the distinct ones).

The product of its digits is 1440, while the sum is 27.

The square root of 1161131544 is about 34075.3803206949. The cubic root of 1161131544 is about 1051.0591109317.

The spelling of 1161131544 in words is "one billion, one hundred sixty-one million, one hundred thirty-one thousand, five hundred forty-four".