191219961 has 16 divisors (see below), whose sum is σ = 271370304. Its totient is φ = 119353344.

The previous prime is 191219929. The next prime is 191219983. The reversal of 191219961 is 169912191.

It is not a de Polignac number, because 191219961 - 2⁵ = 191219929 is a prime.

It is not an unprimeable number, because it can be changed into a prime (191219911) 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, 130 + ... + 19556.

It is an arithmetic number, because the mean of its divisors is an integer number (16960644).

Almost surely, 2^191219961 is an apocalyptic number.

It is an amenable number.

191219961 is a deficient number, since it is larger than the sum of its proper divisors (80150343).

191219961 is a wasteful number, since it uses less digits than its factorization.

191219961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19640.

The product of its digits is 8748, while the sum is 39.

The square root of 191219961 is about 13828.2305809529. The cubic root of 191219961 is about 576.1175101445.

The spelling of 191219961 in words is "one hundred ninety-one million, two hundred nineteen thousand, nine hundred sixty-one".