126137881 has 4 divisors (see below), whose sum is σ = 126489600. Its totient is φ = 125786164.

The previous prime is 126137863. The next prime is 126137959. The reversal of 126137881 is 188731621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 126137881 - 2⁹ = 126137369 is a prime.

It is a super-2 number, since 2×126137881² = 31821530046340322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 126137881.

It is not an unprimeable number, because it can be changed into a prime (126137821) 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 3 ways as a sum of consecutive naturals, for example, 175321 + ... + 176038.

It is an arithmetic number, because the mean of its divisors is an integer number (31622400).

Almost surely, 2^126137881 is an apocalyptic number.

It is an amenable number.

126137881 is a deficient number, since it is larger than the sum of its proper divisors (351719).

126137881 is an equidigital number, since it uses as much as digits as its factorization.

126137881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351718.

The product of its digits is 16128, while the sum is 37.

The square root of 126137881 is about 11231.1121889152. The cubic root of 126137881 is about 501.5125941701.

The spelling of 126137881 in words is "one hundred twenty-six million, one hundred thirty-seven thousand, eight hundred eighty-one".