551731 has 2 divisors, whose sum is σ = 551732. Its totient is φ = 551730.

The previous prime is 551729. The next prime is 551743. The reversal of 551731 is 137155.

551731 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 551731 - 2¹ = 551729 is a prime.

It is a super-2 number, since 2×551731² = 608814192722, which contains 22 as substring.

Together with 551729, it forms a pair of twin primes.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (551231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275865 + 275866.

It is an arithmetic number, because the mean of its divisors is an integer number (275866).

2⁵⁵¹⁷³¹ is an apocalyptic number.

551731 is a deficient number, since it is larger than the sum of its proper divisors (1).

551731 is an equidigital number, since it uses as much as digits as its factorization.

551731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 525, while the sum is 22.

The square root of 551731 is about 742.7859718654. The cubic root of 551731 is about 82.0179912932.

Adding to 551731 its reverse (137155), we get a palindrome (688886).

The spelling of 551731 in words is "five hundred fifty-one thousand, seven hundred thirty-one".