213836491 has 8 divisors (see below), whose sum is σ = 236472624. Its totient is φ = 191733120.

The previous prime is 213836437. The next prime is 213836501. The reversal of 213836491 is 194638312.

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

It is a cyclic number.

It is not a de Polignac number, because 213836491 - 2²³ = 205447883 is a prime.

It is a super-3 number, since 3×213836491³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 213836491.

It is not an unprimeable number, because it can be changed into a prime (213836191) 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 7 ways as a sum of consecutive naturals, for example, 132346 + ... + 133951.

It is an arithmetic number, because the mean of its divisors is an integer number (29559078).

Almost surely, 2^213836491 is an apocalyptic number.

213836491 is a deficient number, since it is larger than the sum of its proper divisors (22636133).

213836491 is a wasteful number, since it uses less digits than its factorization.

213836491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266381.

The product of its digits is 31104, while the sum is 37.

The square root of 213836491 is about 14623.1491478409. The cubic root of 213836491 is about 597.9900251130.

The spelling of 213836491 in words is "two hundred thirteen million, eight hundred thirty-six thousand, four hundred ninety-one".