155603243 has 2 divisors, whose sum is σ = 155603244. Its totient is φ = 155603242.

The previous prime is 155603213. The next prime is 155603249. The reversal of 155603243 is 342306551.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 155603243 - 2⁸ = 155602987 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (155603249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77801621 + 77801622.

It is an arithmetic number, because the mean of its divisors is an integer number (77801622).

Almost surely, 2^155603243 is an apocalyptic number.

155603243 is a deficient number, since it is larger than the sum of its proper divisors (1).

155603243 is an equidigital number, since it uses as much as digits as its factorization.

155603243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10800, while the sum is 29.

The square root of 155603243 is about 12474.1028935952. The cubic root of 155603243 is about 537.8645004091.

Adding to 155603243 its reverse (342306551), we get a palindrome (497909794).

The spelling of 155603243 in words is "one hundred fifty-five million, six hundred three thousand, two hundred forty-three".