126812649 has 4 divisors (see below), whose sum is σ = 169083536. Its totient is φ = 84541764.

The previous prime is 126812611. The next prime is 126812663. The reversal of 126812649 is 946218621.

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: 946218621 = 3 ⋅315406207.

It is not a de Polignac number, because 126812649 - 2⁸ = 126812393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126812149) 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, 21135439 + ... + 21135444.

It is an arithmetic number, because the mean of its divisors is an integer number (42270884).

Almost surely, 2^126812649 is an apocalyptic number.

It is an amenable number.

126812649 is a deficient number, since it is larger than the sum of its proper divisors (42270887).

126812649 is an equidigital number, since it uses as much as digits as its factorization.

126812649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42270886.

The product of its digits is 41472, while the sum is 39.

The square root of 126812649 is about 11261.1122452447. The cubic root of 126812649 is about 502.4052760735.

The spelling of 126812649 in words is "one hundred twenty-six million, eight hundred twelve thousand, six hundred forty-nine".