161297994 has 48 divisors (see below), whose sum is σ = 381102624. Its totient is φ = 45115200.

The previous prime is 161297987. The next prime is 161297999. The reversal of 161297994 is 499792161.

161297994 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (161297999) 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, 3924 + ... + 18384.

It is an arithmetic number, because the mean of its divisors is an integer number (7939638).

Almost surely, 2^161297994 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161297994, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (190551312).

161297994 is an abundant number, since it is smaller than the sum of its proper divisors (219804630).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161297994 is a wasteful number, since it uses less digits than its factorization.

161297994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14503 (or 14490 counting only the distinct ones).

The product of its digits is 244944, while the sum is 48.

The square root of 161297994 is about 12700.3147205099. The cubic root of 161297994 is about 544.3476120475.

The spelling of 161297994 in words is "one hundred sixty-one million, two hundred ninety-seven thousand, nine hundred ninety-four".