1553873 has 2 divisors, whose sum is σ = 1553874. Its totient is φ = 1553872.

The previous prime is 1553869. The next prime is 1553887. The reversal of 1553873 is 3783551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1203409 + 350464 = 1097^2 + 592^2 .

It is an emirp because it is prime and its reverse (3783551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1553873 - 2² = 1553869 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1553803) 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, 776936 + 776937.

It is an arithmetic number, because the mean of its divisors is an integer number (776937).

2^1553873 is an apocalyptic number.

It is an amenable number.

1553873 is a deficient number, since it is larger than the sum of its proper divisors (1).

1553873 is an equidigital number, since it uses as much as digits as its factorization.

1553873 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12600, while the sum is 32.

The square root of 1553873 is about 1246.5444235967. The cubic root of 1553873 is about 115.8257639873.

The spelling of 1553873 in words is "one million, five hundred fifty-three thousand, eight hundred seventy-three".