900551 has 2 divisors, whose sum is σ = 900552. Its totient is φ = 900550.

The previous prime is 900539. The next prime is 900553. The reversal of 900551 is 155009.

It is a strong prime.

It is an emirp because it is prime and its reverse (155009) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 900551 - 2¹⁴ = 884167 is a prime.

Together with 900553, 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 (900553) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 450275 + 450276.

It is an arithmetic number, because the mean of its divisors is an integer number (450276).

2⁹⁰⁰⁵⁵¹ is an apocalyptic number.

900551 is a deficient number, since it is larger than the sum of its proper divisors (1).

900551 is an equidigital number, since it uses as much as digits as its factorization.

900551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 225, while the sum is 20.

The square root of 900551 is about 948.9736561149. The cubic root of 900551 is about 96.5686375763.

The spelling of 900551 in words is "nine hundred thousand, five hundred fifty-one".