161187434 has 4 divisors (see below), whose sum is σ = 241781154. Its totient is φ = 80593716.

The previous prime is 161187409. The next prime is 161187443. The reversal of 161187434 is 434781161.

It is a happy number.

161187434 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in only one way, i.e., 128754409 + 32433025 = 11347^2 + 5695^2 .

It is a junction number, because it is equal to n+sod(n) for n = 161187394 and 161187403.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40296857 + ... + 40296860.

Almost surely, 2^161187434 is an apocalyptic number.

161187434 is a deficient number, since it is larger than the sum of its proper divisors (80593720).

161187434 is an equidigital number, since it uses as much as digits as its factorization.

161187434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80593719.

The product of its digits is 16128, while the sum is 35.

The square root of 161187434 is about 12695.9613263431. The cubic root of 161187434 is about 544.2232111868.

The spelling of 161187434 in words is "one hundred sixty-one million, one hundred eighty-seven thousand, four hundred thirty-four".