161913694 has 4 divisors (see below), whose sum is σ = 242870544. Its totient is φ = 80956846.

The previous prime is 161913677. The next prime is 161913737. The reversal of 161913694 is 496319161.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 496319161 = 13 ⋅38178397.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40478422 + ... + 40478425.

It is an arithmetic number, because the mean of its divisors is an integer number (60717636).

Almost surely, 2^161913694 is an apocalyptic number.

161913694 is a deficient number, since it is larger than the sum of its proper divisors (80956850).

161913694 is an equidigital number, since it uses as much as digits as its factorization.

161913694 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80956849.

The product of its digits is 34992, while the sum is 40.

The square root of 161913694 is about 12724.5311897924. The cubic root of 161913694 is about 545.0393529926.

The spelling of 161913694 in words is "one hundred sixty-one million, nine hundred thirteen thousand, six hundred ninety-four".