551951 has 2 divisors, whose sum is σ = 551952. Its totient is φ = 551950.

The previous prime is 551933. The next prime is 551959. The reversal of 551951 is 159155.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-551951 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 551951.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (551959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275975 + 275976.

It is an arithmetic number, because the mean of its divisors is an integer number (275976).

2⁵⁵¹⁹⁵¹ is an apocalyptic number.

551951 is a deficient number, since it is larger than the sum of its proper divisors (1).

551951 is an equidigital number, since it uses as much as digits as its factorization.

551951 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1125, while the sum is 26.

The square root of 551951 is about 742.9340482169. The cubic root of 551951 is about 82.0288912670.

The spelling of 551951 in words is "five hundred fifty-one thousand, nine hundred fifty-one".