161306199 has 24 divisors (see below), whose sum is σ = 249711072. Its totient is φ = 100077120.

The previous prime is 161306147. The next prime is 161306221. The reversal of 161306199 is 991603161.

161306199 is a `hidden beast` number, since 1 + 6 + 1 + 30 + 619 + 9 = 666.

It is not a de Polignac number, because 161306199 - 2¹⁶ = 161240663 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161306399) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2872 + ... + 18189.

It is an arithmetic number, because the mean of its divisors is an integer number (10404628).

Almost surely, 2^161306199 is an apocalyptic number.

161306199 is a deficient number, since it is larger than the sum of its proper divisors (88404873).

161306199 is a wasteful number, since it uses less digits than its factorization.

161306199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21127 (or 21124 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 36.

The square root of 161306199 is about 12700.6377398932. The cubic root of 161306199 is about 544.3568419545.

The spelling of 161306199 in words is "one hundred sixty-one million, three hundred six thousand, one hundred ninety-nine".