551569 has 2 divisors, whose sum is σ = 551570. Its totient is φ = 551568.

The previous prime is 551557. The next prime is 551581. The reversal of 551569 is 965155.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (551557) and next prime (551581).

It can be written as a sum of positive squares in only one way, i.e., 547600 + 3969 = 740^2 + 63^2 .

It is a cyclic number.

It is not a de Polignac number, because 551569 - 2¹⁵ = 518801 is a prime.

It is a super-2 number, since 2×551569² = 608456723522, which contains 22 as substring.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 551569.

It is not a weakly prime, because it can be changed into another prime (551519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275784 + 275785.

It is an arithmetic number, because the mean of its divisors is an integer number (275785).

2⁵⁵¹⁵⁶⁹ is an apocalyptic number.

It is an amenable number.

551569 is a deficient number, since it is larger than the sum of its proper divisors (1).

551569 is an equidigital number, since it uses as much as digits as its factorization.

551569 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6750, while the sum is 31.

The square root of 551569 is about 742.6769149502. The cubic root of 551569 is about 82.0099630964.

The spelling of 551569 in words is "five hundred fifty-one thousand, five hundred sixty-nine".