213987481 has 16 divisors (see below), whose sum is σ = 230895360. Its totient is φ = 197706960.

The previous prime is 213987467. The next prime is 213987493. The reversal of 213987481 is 184789312.

It is a cyclic number.

It is not a de Polignac number, because 213987481 - 2⁷ = 213987353 is a prime.

It is a super-2 number, since 2×213987481² = 91581284049450722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213987181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 135426 + ... + 136996.

It is an arithmetic number, because the mean of its divisors is an integer number (14430960).

Almost surely, 2^213987481 is an apocalyptic number.

It is an amenable number.

213987481 is a deficient number, since it is larger than the sum of its proper divisors (16907879).

213987481 is a wasteful number, since it uses less digits than its factorization.

213987481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1764.

The product of its digits is 96768, while the sum is 43.

The square root of 213987481 is about 14628.3109414587. The cubic root of 213987481 is about 598.1307389678.

The spelling of 213987481 in words is "two hundred thirteen million, nine hundred eighty-seven thousand, four hundred eighty-one".