1555243 has 2 divisors, whose sum is σ = 1555244. Its totient is φ = 1555242.

The previous prime is 1555231. The next prime is 1555247. The reversal of 1555243 is 3425551.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1555243 is a prime.

It is not a weakly prime, because it can be changed into another prime (1555247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 777621 + 777622.

It is an arithmetic number, because the mean of its divisors is an integer number (777622).

2^1555243 is an apocalyptic number.

1555243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1555243 is an equidigital number, since it uses as much as digits as its factorization.

1555243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3000, while the sum is 25.

The square root of 1555243 is about 1247.0938216510. The cubic root of 1555243 is about 115.8597939423.

The spelling of 1555243 in words is "one million, five hundred fifty-five thousand, two hundred forty-three".