161134431 has 4 divisors (see below), whose sum is σ = 214845912. Its totient is φ = 107422952.

The previous prime is 161134423. The next prime is 161134439. The reversal of 161134431 is 134431161.

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

It is an interprime number because it is at equal distance from previous prime (161134423) and next prime (161134439).

It is a cyclic number.

It is not a de Polignac number, because 161134431 - 2³ = 161134423 is a prime.

It is a super-2 number, since 2×161134431² = 51928609707387522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161134439) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26855736 + ... + 26855741.

It is an arithmetic number, because the mean of its divisors is an integer number (53711478).

Almost surely, 2^161134431 is an apocalyptic number.

161134431 is a deficient number, since it is larger than the sum of its proper divisors (53711481).

161134431 is an equidigital number, since it uses as much as digits as its factorization.

161134431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53711480.

The product of its digits is 864, while the sum is 24.

The square root of 161134431 is about 12693.8737586286. The cubic root of 161134431 is about 544.1635526381.

Adding to 161134431 its reverse (134431161), we get a palindrome (295565592).

The spelling of 161134431 in words is "one hundred sixty-one million, one hundred thirty-four thousand, four hundred thirty-one".