213291998 has 8 divisors (see below), whose sum is σ = 320032080. Its totient is φ = 106614640.

The previous prime is 213291977. The next prime is 213292003. The reversal of 213291998 is 899192312.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

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, 5978 + ... + 21501.

It is an arithmetic number, because the mean of its divisors is an integer number (40004010).

Almost surely, 2^213291998 is an apocalyptic number.

213291998 is a deficient number, since it is larger than the sum of its proper divisors (106740082).

213291998 is a wasteful number, since it uses less digits than its factorization.

213291998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31362.

The product of its digits is 69984, while the sum is 44.

The square root of 213291998 is about 14604.5197798490. The cubic root of 213291998 is about 597.4820386401.

The spelling of 213291998 in words is "two hundred thirteen million, two hundred ninety-one thousand, nine hundred ninety-eight".