947966191 has 4 divisors (see below), whose sum is σ = 948307192. Its totient is φ = 947625192.

The previous prime is 947966141. The next prime is 947966197. The reversal of 947966191 is 191669749.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 191669749 = 73 ⋅2625613.

It is a cyclic number.

It is not a de Polignac number, because 947966191 - 2¹⁹ = 947441903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (947966197) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166296 + ... + 171901.

It is an arithmetic number, because the mean of its divisors is an integer number (237076798).

Almost surely, 2^947966191 is an apocalyptic number.

947966191 is a deficient number, since it is larger than the sum of its proper divisors (341001).

947966191 is a wasteful number, since it uses less digits than its factorization.

947966191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341000.

The product of its digits is 734832, while the sum is 52.

The square root of 947966191 is about 30789.0595991498. The cubic root of 947966191 is about 982.3455516296.

The spelling of 947966191 in words is "nine hundred forty-seven million, nine hundred sixty-six thousand, one hundred ninety-one".