181195642 has 4 divisors (see below), whose sum is σ = 271793466. Its totient is φ = 90597820.

The previous prime is 181195631. The next prime is 181195649. The reversal of 181195642 is 246591181.

181195642 is digitally balanced in base 3, 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., 175536001 + 5659641 = 13249^2 + 2379^2 .

It is not an unprimeable number, because it can be changed into a prime (181195649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45298909 + ... + 45298912.

Almost surely, 2^181195642 is an apocalyptic number.

181195642 is a deficient number, since it is larger than the sum of its proper divisors (90597824).

181195642 is an equidigital number, since it uses as much as digits as its factorization.

181195642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90597823.

The product of its digits is 17280, while the sum is 37.

The square root of 181195642 is about 13460.8930610120. The cubic root of 181195642 is about 565.8690174583.

The spelling of 181195642 in words is "one hundred eighty-one million, one hundred ninety-five thousand, six hundred forty-two".