126974519509 has 4 divisors (see below), whose sum is σ = 132495150816. Its totient is φ = 121453888204.

The previous prime is 126974519473. The next prime is 126974519543. The reversal of 126974519509 is 905915479621.

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 126974519509 - 2³³ = 118384584917 is a prime.

It is a super-2 number, since 2×126974519509² (a number of 23 digits) 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 (126974519549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2760315619 + ... + 2760315664.

It is an arithmetic number, because the mean of its divisors is an integer number (33123787704).

Almost surely, 2^126974519509 is an apocalyptic number.

It is an amenable number.

126974519509 is a deficient number, since it is larger than the sum of its proper divisors (5520631307).

126974519509 is an equidigital number, since it uses as much as digits as its factorization.

126974519509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5520631306.

The product of its (nonzero) digits is 6123600, while the sum is 58.

The spelling of 126974519509 in words is "one hundred twenty-six billion, nine hundred seventy-four million, five hundred nineteen thousand, five hundred nine".