161181429 has 4 divisors (see below), whose sum is σ = 214908576. Its totient is φ = 107454284.

The previous prime is 161181413. The next prime is 161181439. The reversal of 161181429 is 924181161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 924181161 = 3 ⋅308060387.

It is a cyclic number.

It is not a de Polignac number, because 161181429 - 2⁴ = 161181413 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161181429.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161181439) 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, 26863569 + ... + 26863574.

It is an arithmetic number, because the mean of its divisors is an integer number (53727144).

Almost surely, 2^161181429 is an apocalyptic number.

It is an amenable number.

161181429 is a deficient number, since it is larger than the sum of its proper divisors (53727147).

161181429 is an equidigital number, since it uses as much as digits as its factorization.

161181429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53727146.

The product of its digits is 3456, while the sum is 33.

The square root of 161181429 is about 12695.7248316116. The cubic root of 161181429 is about 544.2164528003.

The spelling of 161181429 in words is "one hundred sixty-one million, one hundred eighty-one thousand, four hundred twenty-nine".