291427 has 4 divisors (see below), whose sum is σ = 294120. Its totient is φ = 288736.

The previous prime is 291419. The next prime is 291437. The reversal of 291427 is 724192.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 291427 - 2³ = 291419 is a prime.

It is a Duffinian number.

291427 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (291437) 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, 1177 + ... + 1402.

It is an arithmetic number, because the mean of its divisors is an integer number (73530).

2²⁹¹⁴²⁷ is an apocalyptic number.

291427 is a deficient number, since it is larger than the sum of its proper divisors (2693).

291427 is a wasteful number, since it uses less digits than its factorization.

291427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2692.

The product of its digits is 1008, while the sum is 25.

The square root of 291427 is about 539.8397910492. The cubic root of 291427 is about 66.2994504420.

The spelling of 291427 in words is "two hundred ninety-one thousand, four hundred twenty-seven".