126542779 has 4 divisors (see below), whose sum is σ = 138046680. Its totient is φ = 115038880.

The previous prime is 126542777. The next prime is 126542791. The reversal of 126542779 is 977245621.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 126542779 - 2¹ = 126542777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126542771) 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, 5751934 + ... + 5751955.

It is an arithmetic number, because the mean of its divisors is an integer number (34511670).

Almost surely, 2^126542779 is an apocalyptic number.

126542779 is a deficient number, since it is larger than the sum of its proper divisors (11503901).

126542779 is a wasteful number, since it uses less digits than its factorization.

126542779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11503900.

The product of its digits is 211680, while the sum is 43.

The square root of 126542779 is about 11249.1234769648. The cubic root of 126542779 is about 502.0486334051.

It can be divided in two parts, 1265 and 42779, that added together give a palindrome (44044).

The spelling of 126542779 in words is "one hundred twenty-six million, five hundred forty-two thousand, seven hundred seventy-nine".