126899121 has 4 divisors (see below), whose sum is σ = 169198832. Its totient is φ = 84599412.

The previous prime is 126899117. The next prime is 126899153. The reversal of 126899121 is 121998621.

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 not a de Polignac number, because 126899121 - 2² = 126899117 is a prime.

It is a super-2 number, since 2×126899121² = 32206773821145282, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 126899121.

It is not an unprimeable number, because it can be changed into a prime (126899161) 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, 21149851 + ... + 21149856.

It is an arithmetic number, because the mean of its divisors is an integer number (42299708).

Almost surely, 2^126899121 is an apocalyptic number.

It is an amenable number.

126899121 is a deficient number, since it is larger than the sum of its proper divisors (42299711).

126899121 is an equidigital number, since it uses as much as digits as its factorization.

126899121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42299710.

The product of its digits is 15552, while the sum is 39.

The square root of 126899121 is about 11264.9509985619. The cubic root of 126899121 is about 502.5194448058.

The spelling of 126899121 in words is "one hundred twenty-six million, eight hundred ninety-nine thousand, one hundred twenty-one".