113215381 has 2 divisors, whose sum is σ = 113215382. Its totient is φ = 113215380.

The previous prime is 113215373. The next prime is 113215397. The reversal of 113215381 is 183512311.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 111640356 + 1575025 = 10566^2 + 1255^2 .

It is a cyclic number.

It is not a de Polignac number, because 113215381 - 2³ = 113215373 is a prime.

It is a super-2 number, since 2×113215381² = 25635444989950322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (113215331) by changing a digit.

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 as a sum of consecutive naturals, namely, 56607690 + 56607691.

It is an arithmetic number, because the mean of its divisors is an integer number (56607691).

Almost surely, 2^113215381 is an apocalyptic number.

It is an amenable number.

113215381 is a deficient number, since it is larger than the sum of its proper divisors (1).

113215381 is an equidigital number, since it uses as much as digits as its factorization.

113215381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 720, while the sum is 25.

The square root of 113215381 is about 10640.2716600658. The cubic root of 113215381 is about 483.7657795421.

Adding to 113215381 its reverse (183512311), we get a palindrome (296727692).

The spelling of 113215381 in words is "one hundred thirteen million, two hundred fifteen thousand, three hundred eighty-one".