113451781 has 2 divisors, whose sum is σ = 113451782. Its totient is φ = 113451780.

The previous prime is 113451773. The next prime is 113451803. The reversal of 113451781 is 187154311.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 113230881 + 220900 = 10641^2 + 470^2 .

It is a cyclic number.

It is not a de Polignac number, because 113451781 - 2³ = 113451773 is a prime.

It is a super-2 number, since 2×113451781² = 25742613224143922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (113451181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 56725890 + 56725891.

It is an arithmetic number, because the mean of its divisors is an integer number (56725891).

Almost surely, 2^113451781 is an apocalyptic number.

It is an amenable number.

113451781 is a deficient number, since it is larger than the sum of its proper divisors (1).

113451781 is an equidigital number, since it uses as much as digits as its factorization.

113451781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3360, while the sum is 31.

The square root of 113451781 is about 10651.3746061248. The cubic root of 113451781 is about 484.1022553909.

The spelling of 113451781 in words is "one hundred thirteen million, four hundred fifty-one thousand, seven hundred eighty-one".