551821291 has 6 divisors (see below), whose sum is σ = 641914620. Its totient is φ = 472989636.

The previous prime is 551821253. The next prime is 551821307. The reversal of 551821291 is 192128155.

It is not a de Polignac number, because 551821291 - 2⁷ = 551821163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (551821201) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5630781 + ... + 5630878.

It is an arithmetic number, because the mean of its divisors is an integer number (106985770).

Almost surely, 2^551821291 is an apocalyptic number.

551821291 is a deficient number, since it is larger than the sum of its proper divisors (90093329).

551821291 is a wasteful number, since it uses less digits than its factorization.

551821291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11261673 (or 11261666 counting only the distinct ones).

The product of its digits is 7200, while the sum is 34.

The square root of 551821291 is about 23490.8767609896. The cubic root of 551821291 is about 820.2246514162.

The spelling of 551821291 in words is "five hundred fifty-one million, eight hundred twenty-one thousand, two hundred ninety-one".