113213561 has 2 divisors, whose sum is σ = 113213562. Its totient is φ = 113213560.

The previous prime is 113213549. The next prime is 113213563. The reversal of 113213561 is 165312311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 106090000 + 7123561 = 10300^2 + 2669^2 .

It is an emirp because it is prime and its reverse (165312311) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 113213561 - 2⁶ = 113213497 is a prime.

Together with 113213563, 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 (113213563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 56606780 + 56606781.

It is an arithmetic number, because the mean of its divisors is an integer number (56606781).

Almost surely, 2^113213561 is an apocalyptic number.

It is an amenable number.

113213561 is a deficient number, since it is larger than the sum of its proper divisors (1).

113213561 is an equidigital number, since it uses as much as digits as its factorization.

113213561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 540, while the sum is 23.

The square root of 113213561 is about 10640.1861355899. The cubic root of 113213561 is about 483.7631872606.

Adding to 113213561 its reverse (165312311), we get a palindrome (278525872).

The spelling of 113213561 in words is "one hundred thirteen million, two hundred thirteen thousand, five hundred sixty-one".