1554989 has 2 divisors, whose sum is σ = 1554990. Its totient is φ = 1554988.

The previous prime is 1554977. The next prime is 1555013. The reversal of 1554989 is 9894551.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1085764 + 469225 = 1042^2 + 685^2 .

It is a cyclic number.

It is not a de Polignac number, because 1554989 - 2⁸ = 1554733 is a prime.

It is a Sophie Germain prime.

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1554589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 777494 + 777495.

It is an arithmetic number, because the mean of its divisors is an integer number (777495).

2^1554989 is an apocalyptic number.

It is an amenable number.

1554989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1554989 is an equidigital number, since it uses as much as digits as its factorization.

1554989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64800, while the sum is 41.

The square root of 1554989 is about 1246.9919807280. The cubic root of 1554989 is about 115.8534862485.

The spelling of 1554989 in words is "one million, five hundred fifty-four thousand, nine hundred eighty-nine".