126915917 has 4 divisors (see below), whose sum is σ = 126966240. Its totient is φ = 126865596.

The previous prime is 126915913. The next prime is 126915941. The reversal of 126915917 is 719519621.

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: 719519621 = 4139 ⋅173839.

It is a cyclic number.

It is not a de Polignac number, because 126915917 - 2² = 126915913 is a prime.

It is a super-2 number, since 2×126915917² = 32215299975901778, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126915911) 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, 21167 + ... + 26492.

It is an arithmetic number, because the mean of its divisors is an integer number (31741560).

Almost surely, 2^126915917 is an apocalyptic number.

It is an amenable number.

126915917 is a deficient number, since it is larger than the sum of its proper divisors (50323).

126915917 is an equidigital number, since it uses as much as digits as its factorization.

126915917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50322.

The product of its digits is 34020, while the sum is 41.

The square root of 126915917 is about 11265.6964720340. The cubic root of 126915917 is about 502.5416145004.

The spelling of 126915917 in words is "one hundred twenty-six million, nine hundred fifteen thousand, nine hundred seventeen".