551321251 has 4 divisors (see below), whose sum is σ = 593730592. Its totient is φ = 508911912.

The previous prime is 551321231. The next prime is 551321273. The reversal of 551321251 is 152123155.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 551321251 - 2⁷ = 551321123 is a prime.

It is not an unprimeable number, because it can be changed into a prime (551321231) 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, 21204651 + ... + 21204676.

It is an arithmetic number, because the mean of its divisors is an integer number (148432648).

Almost surely, 2^551321251 is an apocalyptic number.

551321251 is a deficient number, since it is larger than the sum of its proper divisors (42409341).

551321251 is a wasteful number, since it uses less digits than its factorization.

551321251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42409340.

The product of its digits is 1500, while the sum is 25.

The square root of 551321251 is about 23480.2310678579. The cubic root of 551321251 is about 819.9768241516.

The spelling of 551321251 in words is "five hundred fifty-one million, three hundred twenty-one thousand, two hundred fifty-one".