2291478291 has 6 divisors (see below), whose sum is σ = 3309913100. Its totient is φ = 1527652188.

The previous prime is 2291478269. The next prime is 2291478311. The reversal of 2291478291 is 1928741922.

2291478291 is a `hidden beast` number, since 2 + 2 + 91 + 478 + 2 + 91 = 666.

It is not a de Polignac number, because 2291478291 - 2⁶ = 2291478227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2291478251) 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, 127304341 + ... + 127304358.

Almost surely, 2^2291478291 is an apocalyptic number.

2291478291 is a deficient number, since it is larger than the sum of its proper divisors (1018434809).

2291478291 is a wasteful number, since it uses less digits than its factorization.

2291478291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254608705 (or 254608702 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 2291478291 is about 47869.3878277130. The cubic root of 2291478291 is about 1318.3738566930.

The spelling of 2291478291 in words is "two billion, two hundred ninety-one million, four hundred seventy-eight thousand, two hundred ninety-one".