210681481 has 4 divisors (see below), whose sum is σ = 221770000. Its totient is φ = 199592964.

The previous prime is 210681463. The next prime is 210681509. The reversal of 210681481 is 184186012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 210681481 - 2¹³ = 210673289 is a prime.

It is a super-2 number, since 2×210681481² = 88773372872706722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (210681421) 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, 5544231 + ... + 5544268.

It is an arithmetic number, because the mean of its divisors is an integer number (55442500).

Almost surely, 2^210681481 is an apocalyptic number.

It is an amenable number.

210681481 is a deficient number, since it is larger than the sum of its proper divisors (11088519).

210681481 is a wasteful number, since it uses less digits than its factorization.

210681481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11088518.

The product of its (nonzero) digits is 3072, while the sum is 31.

The square root of 210681481 is about 14514.8710293960. The cubic root of 210681481 is about 595.0344644961.

The spelling of 210681481 in words is "two hundred ten million, six hundred eighty-one thousand, four hundred eighty-one".