161872699 has 2 divisors, whose sum is σ = 161872700. Its totient is φ = 161872698.

The previous prime is 161872681. The next prime is 161872709. The reversal of 161872699 is 996278161.

It is a strong prime.

It is an emirp because it is prime and its reverse (996278161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161872699 - 2⁹ = 161872187 is a prime.

It is not a weakly prime, because it can be changed into another prime (161872649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80936349 + 80936350.

It is an arithmetic number, because the mean of its divisors is an integer number (80936350).

Almost surely, 2^161872699 is an apocalyptic number.

161872699 is a deficient number, since it is larger than the sum of its proper divisors (1).

161872699 is an equidigital number, since it uses as much as digits as its factorization.

161872699 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 49.

The square root of 161872699 is about 12722.9202229677. The cubic root of 161872699 is about 544.9933495247.

The spelling of 161872699 in words is "one hundred sixty-one million, eight hundred seventy-two thousand, six hundred ninety-nine".