1161445431 has 4 divisors (see below), whose sum is σ = 1548593912. Its totient is φ = 774296952.

The previous prime is 1161445393. The next prime is 1161445463. The reversal of 1161445431 is 1345441611.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1161445431 - 2⁶ = 1161445367 is a prime.

It is a super-2 number, since 2×1161445431² = 2697910978381551522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161445231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 193574236 + ... + 193574241.

It is an arithmetic number, because the mean of its divisors is an integer number (387148478).

Almost surely, 2^1161445431 is an apocalyptic number.

1161445431 is a deficient number, since it is larger than the sum of its proper divisors (387148481).

1161445431 is an equidigital number, since it uses as much as digits as its factorization.

1161445431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387148480.

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

The square root of 1161445431 is about 34079.9857834477. The cubic root of 1161445431 is about 1051.1538128252.

The spelling of 1161445431 in words is "one billion, one hundred sixty-one million, four hundred forty-five thousand, four hundred thirty-one".