126305881 has 8 divisors (see below), whose sum is σ = 136208520. Its totient is φ = 116429952.

The previous prime is 126305867. The next prime is 126305891. The reversal of 126305881 is 188503621.

It can be written as a sum of positive squares in 4 ways, for example, as 9665881 + 116640000 = 3109^2 + 10800^2 .

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 126305881 - 2⁵ = 126305849 is a prime.

It is a super-2 number, since 2×126305881² = 31906351150372322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126305891) 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, 3765 + ... + 16333.

It is an arithmetic number, because the mean of its divisors is an integer number (17026065).

Almost surely, 2^126305881 is an apocalyptic number.

It is an amenable number.

126305881 is a deficient number, since it is larger than the sum of its proper divisors (9902639).

126305881 is a wasteful number, since it uses less digits than its factorization.

126305881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13355.

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 126305881 is about 11238.5889238819. The cubic root of 126305881 is about 501.7351462363.

The spelling of 126305881 in words is "one hundred twenty-six million, three hundred five thousand, eight hundred eighty-one".