214267991 has 4 divisors (see below), whose sum is σ = 244877712. Its totient is φ = 183658272.

The previous prime is 214267973. The next prime is 214267993. The reversal of 214267991 is 199762412.

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

It is not a de Polignac number, because 214267991 - 2¹⁴ = 214251607 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 (214267993) 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, 15304850 + ... + 15304863.

It is an arithmetic number, because the mean of its divisors is an integer number (61219428).

Almost surely, 2^214267991 is an apocalyptic number.

214267991 is a deficient number, since it is larger than the sum of its proper divisors (30609721).

214267991 is an equidigital number, since it uses as much as digits as its factorization.

214267991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30609720.

The product of its digits is 54432, while the sum is 41.

The square root of 214267991 is about 14637.8957162565. The cubic root of 214267991 is about 598.3919822779.

The spelling of 214267991 in words is "two hundred fourteen million, two hundred sixty-seven thousand, nine hundred ninety-one".