161198961 has 16 divisors (see below), whose sum is σ = 267967488. Its totient is φ = 83739600.

The previous prime is 161198957. The next prime is 161198971. The reversal of 161198961 is 169891161.

It is a happy number.

It is not a de Polignac number, because 161198961 - 2² = 161198957 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161198911) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 348685 + ... + 349146.

It is an arithmetic number, because the mean of its divisors is an integer number (16747968).

Almost surely, 2^161198961 is an apocalyptic number.

161198961 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

161198961 is a deficient number, since it is larger than the sum of its proper divisors (106768527).

161198961 is a wasteful number, since it uses less digits than its factorization.

161198961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 697852.

The product of its digits is 23328, while the sum is 42.

The square root of 161198961 is about 12696.4152814879. The cubic root of 161198961 is about 544.2361838925.

The spelling of 161198961 in words is "one hundred sixty-one million, one hundred ninety-eight thousand, nine hundred sixty-one".