126688251 has 4 divisors (see below), whose sum is σ = 168917672. Its totient is φ = 84458832.

The previous prime is 126688231. The next prime is 126688253. The reversal of 126688251 is 152886621.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 126688251 - 2⁷ = 126688123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126688253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21114706 + ... + 21114711.

It is an arithmetic number, because the mean of its divisors is an integer number (42229418).

Almost surely, 2^126688251 is an apocalyptic number.

126688251 is a deficient number, since it is larger than the sum of its proper divisors (42229421).

126688251 is an equidigital number, since it uses as much as digits as its factorization.

126688251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42229420.

The product of its digits is 46080, while the sum is 39.

The square root of 126688251 is about 11255.5875457481. The cubic root of 126688251 is about 502.2409426803.

The spelling of 126688251 in words is "one hundred twenty-six million, six hundred eighty-eight thousand, two hundred fifty-one".