291214231 has 16 divisors (see below), whose sum is σ = 363479040. Its totient is φ = 226666080.

The previous prime is 291214219. The next prime is 291214243. The reversal of 291214231 is 132412192.

It is an interprime number because it is at equal distance from previous prime (291214219) and next prime (291214243).

It is a cyclic number.

It is not a de Polignac number, because 291214231 - 2¹⁷ = 291083159 is a prime.

It is a super-2 number, since 2×291214231² = 169611456673842722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 291214196 and 291214205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (291214211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 97005 + ... + 99961.

It is an arithmetic number, because the mean of its divisors is an integer number (22717440).

Almost surely, 2^291214231 is an apocalyptic number.

291214231 is a deficient number, since it is larger than the sum of its proper divisors (72264809).

291214231 is a wasteful number, since it uses less digits than its factorization.

291214231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4254.

The product of its digits is 864, while the sum is 25.

The square root of 291214231 is about 17065.0001757984. Note that the first 3 decimals coincide. The cubic root of 291214231 is about 662.8331157796.

The spelling of 291214231 in words is "two hundred ninety-one million, two hundred fourteen thousand, two hundred thirty-one".