1161544431 has 8 divisors (see below), whose sum is σ = 1639827504. Its totient is φ = 728812160.

The previous prime is 1161544427. The next prime is 1161544457. The reversal of 1161544431 is 1344451611.

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

It is a cyclic number.

It is not a de Polignac number, because 1161544431 - 2² = 1161544427 is a prime.

It is a super-2 number, since 2×1161544431² = 2698370930374227522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161544411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11387640 + ... + 11387741.

It is an arithmetic number, because the mean of its divisors is an integer number (204978438).

Almost surely, 2^1161544431 is an apocalyptic number.

1161544431 is a deficient number, since it is larger than the sum of its proper divisors (478283073).

1161544431 is a wasteful number, since it uses less digits than its factorization.

1161544431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22775401.

The product of its digits is 5760, while the sum is 30.

The square root of 1161544431 is about 34081.4382178922. The cubic root of 1161544431 is about 1051.1836782750.

The spelling of 1161544431 in words is "one billion, one hundred sixty-one million, five hundred forty-four thousand, four hundred thirty-one".