551473721 has 4 divisors (see below), whose sum is σ = 551596944. Its totient is φ = 551350500.

The previous prime is 551473711. The next prime is 551473729. The reversal of 551473721 is 127374155.

551473721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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: 127374155 = 5 ⋅25474831.

It is a cyclic number.

It is not a de Polignac number, because 551473721 - 2¹⁴ = 551457337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (551473729) 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, 54635 + ... + 63936.

It is an arithmetic number, because the mean of its divisors is an integer number (137899236).

Almost surely, 2^551473721 is an apocalyptic number.

It is an amenable number.

551473721 is a deficient number, since it is larger than the sum of its proper divisors (123223).

551473721 is a wasteful number, since it uses less digits than its factorization.

551473721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123222.

The product of its digits is 29400, while the sum is 35.

The square root of 551473721 is about 23483.4776172525. The cubic root of 551473721 is about 820.0524064265.

The spelling of 551473721 in words is "five hundred fifty-one million, four hundred seventy-three thousand, seven hundred twenty-one".