126805081 has 8 divisors (see below), whose sum is σ = 141268680. Its totient is φ = 113014272.

The previous prime is 126805079. The next prime is 126805099. The reversal of 126805081 is 180508621.

It can be written as a sum of positive squares in 4 ways, for example, as 40000 + 126765081 = 200^2 + 11259^2 .

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 126805081 - 2¹ = 126805079 is a prime.

It is a super-2 number, since 2×126805081² = 32159057134833122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126805181) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 167800 + ... + 168553.

It is an arithmetic number, because the mean of its divisors is an integer number (17658585).

Almost surely, 2^126805081 is an apocalyptic number.

It is an amenable number.

126805081 is a deficient number, since it is larger than the sum of its proper divisors (14463599).

126805081 is a wasteful number, since it uses less digits than its factorization.

126805081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336395.

The product of its (nonzero) digits is 3840, while the sum is 31.

The square root of 126805081 is about 11260.7762165847. The cubic root of 126805081 is about 502.3952815953.

The spelling of 126805081 in words is "one hundred twenty-six million, eight hundred five thousand, eighty-one".