113749781 has 2 divisors, whose sum is σ = 113749782. Its totient is φ = 113749780.

The previous prime is 113749777. The next prime is 113749799. The reversal of 113749781 is 187947311.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58767556 + 54982225 = 7666^2 + 7415^2 .

It is a cyclic number.

It is not a de Polignac number, because 113749781 - 2² = 113749777 is a prime.

It is a super-2 number, since 2×113749781² = 25878025355095922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (113749681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 56874890 + 56874891.

It is an arithmetic number, because the mean of its divisors is an integer number (56874891).

Almost surely, 2^113749781 is an apocalyptic number.

It is an amenable number.

113749781 is a deficient number, since it is larger than the sum of its proper divisors (1).

113749781 is an equidigital number, since it uses as much as digits as its factorization.

113749781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42336, while the sum is 41.

The square root of 113749781 is about 10665.3542369675. The cubic root of 113749781 is about 484.5257432229.

The spelling of 113749781 in words is "one hundred thirteen million, seven hundred forty-nine thousand, seven hundred eighty-one".