291551 has 8 divisors (see below), whose sum is σ = 322224. Its totient is φ = 262080.

The previous prime is 291547. The next prime is 291559. The reversal of 291551 is 155192.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 291551 - 2² = 291547 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 (291559) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 260 + ... + 806.

It is an arithmetic number, because the mean of its divisors is an integer number (40278).

2²⁹¹⁵⁵¹ is an apocalyptic number.

291551 is a deficient number, since it is larger than the sum of its proper divisors (30673).

291551 is a wasteful number, since it uses less digits than its factorization.

291551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 601.

The product of its digits is 450, while the sum is 23.

The square root of 291551 is about 539.9546277235. The cubic root of 291551 is about 66.3088524147.

The spelling of 291551 in words is "two hundred ninety-one thousand, five hundred fifty-one".