1889551 has 2 divisors, whose sum is σ = 1889552. Its totient is φ = 1889550.

The previous prime is 1889539. The next prime is 1889561. The reversal of 1889551 is 1559881.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1889551 - 2⁷ = 1889423 is a prime.

1889551 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1889551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1889501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 944775 + 944776.

It is an arithmetic number, because the mean of its divisors is an integer number (944776).

2^1889551 is an apocalyptic number.

1889551 is a deficient number, since it is larger than the sum of its proper divisors (1).

1889551 is an equidigital number, since it uses as much as digits as its factorization.

1889551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14400, while the sum is 37.

The square root of 1889551 is about 1374.6093990658. The cubic root of 1889551 is about 123.6287674405.

The spelling of 1889551 in words is "one million, eight hundred eighty-nine thousand, five hundred fifty-one".