113438821 has 2 divisors, whose sum is σ = 113438822. Its totient is φ = 113438820.

The previous prime is 113438771. The next prime is 113438863. The reversal of 113438821 is 128834311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70392100 + 43046721 = 8390^2 + 6561^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-113438821 is a prime.

It is a super-2 number, since 2×113438821² = 25736732219740082, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (113438321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 56719410 + 56719411.

It is an arithmetic number, because the mean of its divisors is an integer number (56719411).

Almost surely, 2^113438821 is an apocalyptic number.

It is an amenable number.

113438821 is a deficient number, since it is larger than the sum of its proper divisors (1).

113438821 is an equidigital number, since it uses as much as digits as its factorization.

113438821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4608, while the sum is 31.

The square root of 113438821 is about 10650.7662165686. The cubic root of 113438821 is about 484.0838211155.

It can be divided in two parts, 11343 and 8821, that added together give a square (20164 = 142²).

The spelling of 113438821 in words is "one hundred thirteen million, four hundred thirty-eight thousand, eight hundred twenty-one".