842550721 has 4 divisors (see below), whose sum is σ = 853216000. Its totient is φ = 831885444.

The previous prime is 842550703. The next prime is 842550773. The reversal of 842550721 is 127055248.

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 a cyclic number.

It is not a de Polignac number, because 842550721 - 2⁵ = 842550689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (842550781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5332521 + ... + 5332678.

It is an arithmetic number, because the mean of its divisors is an integer number (213304000).

Almost surely, 2^842550721 is an apocalyptic number.

It is an amenable number.

842550721 is a deficient number, since it is larger than the sum of its proper divisors (10665279).

842550721 is a wasteful number, since it uses less digits than its factorization.

842550721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10665278.

The product of its (nonzero) digits is 22400, while the sum is 34.

The square root of 842550721 is about 29026.7242554168. The cubic root of 842550721 is about 944.4928723644.

The spelling of 842550721 in words is "eight hundred forty-two million, five hundred fifty thousand, seven hundred twenty-one".