161203191 has 8 divisors (see below), whose sum is σ = 220746864. Its totient is φ = 104564160.

The previous prime is 161203183. The next prime is 161203219. The reversal of 161203191 is 191302161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 161203191 - 2³ = 161203183 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161203111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 726030 + ... + 726251.

It is an arithmetic number, because the mean of its divisors is an integer number (27593358).

Almost surely, 2^161203191 is an apocalyptic number.

161203191 is a deficient number, since it is larger than the sum of its proper divisors (59543673).

161203191 is a wasteful number, since it uses less digits than its factorization.

161203191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1452321.

The product of its (nonzero) digits is 324, while the sum is 24.

The square root of 161203191 is about 12696.5818628480. The cubic root of 161203191 is about 544.2409442601.

The spelling of 161203191 in words is "one hundred sixty-one million, two hundred three thousand, one hundred ninety-one".