213698391 has 4 divisors (see below), whose sum is σ = 284931192. Its totient is φ = 142465592.

The previous prime is 213698389. The next prime is 213698393. The reversal of 213698391 is 193896312.

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

It is an interprime number because it is at equal distance from previous prime (213698389) and next prime (213698393).

It is a cyclic number.

It is not a de Polignac number, because 213698391 - 2¹ = 213698389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213698393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35616396 + ... + 35616401.

It is an arithmetic number, because the mean of its divisors is an integer number (71232798).

Almost surely, 2^213698391 is an apocalyptic number.

213698391 is a deficient number, since it is larger than the sum of its proper divisors (71232801).

213698391 is an equidigital number, since it uses as much as digits as its factorization.

213698391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71232800.

The product of its digits is 69984, while the sum is 42.

The square root of 213698391 is about 14618.4264201042. The cubic root of 213698391 is about 597.8612659751.

The spelling of 213698391 in words is "two hundred thirteen million, six hundred ninety-eight thousand, three hundred ninety-one".