1005551 has 2 divisors, whose sum is σ = 1005552. Its totient is φ = 1005550.

The previous prime is 1005541. The next prime is 1005553. The reversal of 1005551 is 1555001.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1005551 - 2¹⁰ = 1004527 is a prime.

It is a super-2 number, since 2×1005551² = 2022265627202, which contains 22 as substring.

Together with 1005553, 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 (1005553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 502775 + 502776.

It is an arithmetic number, because the mean of its divisors is an integer number (502776).

2^1005551 is an apocalyptic number.

1005551 is a deficient number, since it is larger than the sum of its proper divisors (1).

1005551 is an equidigital number, since it uses as much as digits as its factorization.

1005551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 125, while the sum is 17.

The square root of 1005551 is about 1002.7716589533. The cubic root of 1005551 is about 100.1846920119.

The spelling of 1005551 in words is "one million, five thousand, five hundred fifty-one".