126163781 has 8 divisors (see below), whose sum is σ = 133229280. Its totient is φ = 119140848.

The previous prime is 126163777. The next prime is 126163789. The reversal of 126163781 is 187361621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 126163781 - 2² = 126163777 is a prime.

It is a super-2 number, since 2×126163781² = 31834599272431922, 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 (126163789) 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 in 7 ways as a sum of consecutive naturals, for example, 4451 + ... + 16496.

It is an arithmetic number, because the mean of its divisors is an integer number (16653660).

Almost surely, 2^126163781 is an apocalyptic number.

It is an amenable number.

126163781 is a deficient number, since it is larger than the sum of its proper divisors (7065499).

126163781 is a wasteful number, since it uses less digits than its factorization.

126163781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21283.

The product of its digits is 12096, while the sum is 35.

The square root of 126163781 is about 11232.2651767130. The cubic root of 126163781 is about 501.5469171590.

The spelling of 126163781 in words is "one hundred twenty-six million, one hundred sixty-three thousand, seven hundred eighty-one".