126542649 has 4 divisors (see below), whose sum is σ = 168723536. Its totient is φ = 84361764.

The previous prime is 126542629. The next prime is 126542671. The reversal of 126542649 is 946245621.

It is a happy number.

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 not a de Polignac number, because 126542649 - 2⁵ = 126542617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126542629) 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, 21090439 + ... + 21090444.

It is an arithmetic number, because the mean of its divisors is an integer number (42180884).

Almost surely, 2^126542649 is an apocalyptic number.

It is an amenable number.

126542649 is a deficient number, since it is larger than the sum of its proper divisors (42180887).

126542649 is an equidigital number, since it uses as much as digits as its factorization.

126542649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42180886.

The product of its digits is 103680, while the sum is 39.

The square root of 126542649 is about 11249.1176987353. The cubic root of 126542649 is about 502.0484614834.

The spelling of 126542649 in words is "one hundred twenty-six million, five hundred forty-two thousand, six hundred forty-nine".