291928427 has 6 divisors (see below), whose sum is σ = 339590268. Its totient is φ = 250224324.

The previous prime is 291928393. The next prime is 291928453. The reversal of 291928427 is 724829192.

It is not a de Polignac number, because 291928427 - 2⁸ = 291928171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (291928727) 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, 2978813 + ... + 2978910.

It is an arithmetic number, because the mean of its divisors is an integer number (56598378).

Almost surely, 2^291928427 is an apocalyptic number.

291928427 is a deficient number, since it is larger than the sum of its proper divisors (47661841).

291928427 is an equidigital number, since it uses as much as digits as its factorization.

291928427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5957737 (or 5957730 counting only the distinct ones).

The product of its digits is 145152, while the sum is 44.

The square root of 291928427 is about 17085.9131157805. The cubic root of 291928427 is about 663.3745342511.

The spelling of 291928427 in words is "two hundred ninety-one million, nine hundred twenty-eight thousand, four hundred twenty-seven".