126311217 has 4 divisors (see below), whose sum is σ = 168414960. Its totient is φ = 84207476.

The previous prime is 126311209. The next prime is 126311219. The reversal of 126311217 is 712113621.

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, and also an emirpimes, since its reverse is a distinct semiprime: 712113621 = 3 ⋅237371207.

It is a cyclic number.

It is not a de Polignac number, because 126311217 - 2³ = 126311209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (126311219) 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, 21051867 + ... + 21051872.

It is an arithmetic number, because the mean of its divisors is an integer number (42103740).

Almost surely, 2^126311217 is an apocalyptic number.

It is an amenable number.

126311217 is a deficient number, since it is larger than the sum of its proper divisors (42103743).

126311217 is an equidigital number, since it uses as much as digits as its factorization.

126311217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42103742.

The product of its digits is 504, while the sum is 24.

The square root of 126311217 is about 11238.8263177255. The cubic root of 126311217 is about 501.7422116794.

Adding to 126311217 its reverse (712113621), we get a palindrome (838424838).

The spelling of 126311217 in words is "one hundred twenty-six million, three hundred eleven thousand, two hundred seventeen".