126157509 has 6 divisors (see below), whose sum is σ = 182227526. Its totient is φ = 84105000.

The previous prime is 126157501. The next prime is 126157523. The reversal of 126157509 is 905751621.

It can be written as a sum of positive squares in only one way, i.e., 83777409 + 42380100 = 9153^2 + 6510^2 .

It is not a de Polignac number, because 126157509 - 2³ = 126157501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126157501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7008742 + ... + 7008759.

Almost surely, 2^126157509 is an apocalyptic number.

It is an amenable number.

126157509 is a deficient number, since it is larger than the sum of its proper divisors (56070017).

126157509 is a wasteful number, since it uses less digits than its factorization.

126157509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14017507 (or 14017504 counting only the distinct ones).

The product of its (nonzero) digits is 18900, while the sum is 36.

The square root of 126157509 is about 11231.9859775553. The cubic root of 126157509 is about 501.5386058609.

The spelling of 126157509 in words is "one hundred twenty-six million, one hundred fifty-seven thousand, five hundred nine".