947872091 has 4 divisors (see below), whose sum is σ = 969915672. Its totient is φ = 925828512.

The previous prime is 947872049. The next prime is 947872097. The reversal of 947872091 is 190278749.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 190278749 = 19 ⋅10014671.

It is a cyclic number.

It is not a de Polignac number, because 947872091 - 2¹⁴ = 947855707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (947872097) 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, 11021726 + ... + 11021811.

It is an arithmetic number, because the mean of its divisors is an integer number (242478918).

Almost surely, 2^947872091 is an apocalyptic number.

947872091 is a deficient number, since it is larger than the sum of its proper divisors (22043581).

947872091 is a wasteful number, since it uses less digits than its factorization.

947872091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22043580.

The product of its (nonzero) digits is 254016, while the sum is 47.

The square root of 947872091 is about 30787.5314210152. The cubic root of 947872091 is about 982.3130463299.

The spelling of 947872091 in words is "nine hundred forty-seven million, eight hundred seventy-two thousand, ninety-one".