113164781 has 4 divisors (see below), whose sum is σ = 114203100. Its totient is φ = 112126464.

The previous prime is 113164739. The next prime is 113164783. The reversal of 113164781 is 187461311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 187461311 = 1181 ⋅158731.

It can be written as a sum of positive squares in 2 ways, for example, as 32775625 + 80389156 = 5725^2 + 8966^2 .

It is a cyclic number.

It is not a de Polignac number, because 113164781 - 2²⁶ = 46055917 is a prime.

It is a super-2 number, since 2×113164781² = 25612535317555922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (113164783) 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 in 3 ways as a sum of consecutive naturals, for example, 518996 + ... + 519213.

It is an arithmetic number, because the mean of its divisors is an integer number (28550775).

Almost surely, 2^113164781 is an apocalyptic number.

It is an amenable number.

113164781 is a deficient number, since it is larger than the sum of its proper divisors (1038319).

113164781 is a wasteful number, since it uses less digits than its factorization.

113164781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1038318.

The product of its digits is 4032, while the sum is 32.

The square root of 113164781 is about 10637.8936354901. The cubic root of 113164781 is about 483.6936980637.

It can be divided in two parts, 113 and 164781, that multiplied together give a triangular number (18620253 = T₆₁₀₂).

The spelling of 113164781 in words is "one hundred thirteen million, one hundred sixty-four thousand, seven hundred eighty-one".