191693961 has 6 divisors (see below), whose sum is σ = 276891290. Its totient is φ = 127795968.

The previous prime is 191693947. The next prime is 191694001. The reversal of 191693961 is 169396191.

It can be written as a sum of positive squares in only one way, i.e., 155151936 + 36542025 = 12456^2 + 6045^2 .

It is not a de Polignac number, because 191693961 - 2⁹ = 191693449 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (191693911) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10649656 + ... + 10649673.

Almost surely, 2^191693961 is an apocalyptic number.

It is an amenable number.

191693961 is a deficient number, since it is larger than the sum of its proper divisors (85197329).

191693961 is a wasteful number, since it uses less digits than its factorization.

191693961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21299335 (or 21299332 counting only the distinct ones).

The product of its digits is 78732, while the sum is 45.

The square root of 191693961 is about 13845.3588252526. The cubic root of 191693961 is about 576.5931480260.

The spelling of 191693961 in words is "one hundred ninety-one million, six hundred ninety-three thousand, nine hundred sixty-one".