551403989 has 2 divisors, whose sum is σ = 551403990. Its totient is φ = 551403988.

The previous prime is 551403977. The next prime is 551403991. The reversal of 551403989 is 989304155.

It is a happy number.

551403989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 530519089 + 20884900 = 23033^2 + 4570^2 .

It is a cyclic number.

It is not a de Polignac number, because 551403989 - 2⁴ = 551403973 is a prime.

It is a super-2 number, since 2×551403989² = 608092718170224242, which contains 22 as substring.

Together with 551403991, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (551403929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275701994 + 275701995.

It is an arithmetic number, because the mean of its divisors is an integer number (275701995).

Almost surely, 2^551403989 is an apocalyptic number.

It is an amenable number.

551403989 is a deficient number, since it is larger than the sum of its proper divisors (1).

551403989 is an equidigital number, since it uses as much as digits as its factorization.

551403989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 194400, while the sum is 44.

The square root of 551403989 is about 23481.9928668757. The cubic root of 551403989 is about 820.0178406787.

The spelling of 551403989 in words is "five hundred fifty-one million, four hundred three thousand, nine hundred eighty-nine".