213013481 has 2 divisors, whose sum is σ = 213013482. Its totient is φ = 213013480.

The previous prime is 213013459. The next prime is 213013483. The reversal of 213013481 is 184310312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 203347600 + 9665881 = 14260^2 + 3109^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213013481 is a prime.

It is a super-2 number, since 2×213013481² = 90749486175474722, which contains 22 as substring.

Together with 213013483, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (213013483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106506740 + 106506741.

It is an arithmetic number, because the mean of its divisors is an integer number (106506741).

Almost surely, 2^213013481 is an apocalyptic number.

It is an amenable number.

213013481 is a deficient number, since it is larger than the sum of its proper divisors (1).

213013481 is an equidigital number, since it uses as much as digits as its factorization.

213013481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 213013481 is about 14594.9813634687. The cubic root of 213013481 is about 597.2218610565.

Adding to 213013481 its reverse (184310312), we get a palindrome (397323793).

The spelling of 213013481 in words is "two hundred thirteen million, thirteen thousand, four hundred eighty-one".