9191961 has 20 divisors (see below), whose sum is σ = 13817232. Its totient is φ = 6114852.

The previous prime is 9191957. The next prime is 9191969. The reversal of 9191961 is 1691919.

It is not a de Polignac number, because 9191961 - 2² = 9191957 is a prime.

9191961 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (9191969) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 19450 + ... + 19916.

Almost surely, 2^9191961 is an apocalyptic number.

It is an amenable number.

9191961 is a deficient number, since it is larger than the sum of its proper divisors (4625271).

9191961 is an frugal number, since it uses more digits than its factorization.

9191961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 494 (or 470 counting only the distinct ones).

The product of its digits is 4374, while the sum is 36.

The square root of 9191961 is about 3031.8246980985. The cubic root of 9191961 is about 209.4768611367.

The spelling of 9191961 in words is "nine million, one hundred ninety-one thousand, nine hundred sixty-one".