1089551 has 2 divisors, whose sum is σ = 1089552. Its totient is φ = 1089550.

The previous prime is 1089523. The next prime is 1089563. The reversal of 1089551 is 1559801.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1089551 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1085551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 544775 + 544776.

It is an arithmetic number, because the mean of its divisors is an integer number (544776).

2^1089551 is an apocalyptic number.

1089551 is a deficient number, since it is larger than the sum of its proper divisors (1).

1089551 is an equidigital number, since it uses as much as digits as its factorization.

1089551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1800, while the sum is 29.

The square root of 1089551 is about 1043.8155967411. The cubic root of 1089551 is about 102.9001136776.

The spelling of 1089551 in words is "one million, eighty-nine thousand, five hundred fifty-one".