551540111 has 2 divisors, whose sum is σ = 551540112. Its totient is φ = 551540110.

The previous prime is 551540057. The next prime is 551540137. The reversal of 551540111 is 111045155.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 551540111 - 2¹⁸ = 551277967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (551546111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275770055 + 275770056.

It is an arithmetic number, because the mean of its divisors is an integer number (275770056).

Almost surely, 2^551540111 is an apocalyptic number.

551540111 is a deficient number, since it is larger than the sum of its proper divisors (1).

551540111 is an equidigital number, since it uses as much as digits as its factorization.

551540111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 500, while the sum is 23.

The square root of 551540111 is about 23484.8911217404. The cubic root of 551540111 is about 820.0853128568.

Adding to 551540111 its reverse (111045155), we get a palindrome (662585266).

The spelling of 551540111 in words is "five hundred fifty-one million, five hundred forty thousand, one hundred eleven".