126553809 has 4 divisors (see below), whose sum is σ = 168738416. Its totient is φ = 84369204.

The previous prime is 126553807. The next prime is 126553829. The reversal of 126553809 is 908355621.

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 126553809 - 2¹ = 126553807 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (126553807) 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, 21092299 + ... + 21092304.

It is an arithmetic number, because the mean of its divisors is an integer number (42184604).

Almost surely, 2^126553809 is an apocalyptic number.

It is an amenable number.

126553809 is a deficient number, since it is larger than the sum of its proper divisors (42184607).

126553809 is an equidigital number, since it uses as much as digits as its factorization.

126553809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42184606.

The product of its (nonzero) digits is 64800, while the sum is 39.

The square root of 126553809 is about 11249.6137267019. The cubic root of 126553809 is about 502.0632198704.

The spelling of 126553809 in words is "one hundred twenty-six million, five hundred fifty-three thousand, eight hundred nine".