155687243 has 2 divisors, whose sum is σ = 155687244. Its totient is φ = 155687242.

The previous prime is 155687201. The next prime is 155687251. The reversal of 155687243 is 342786551.

155687243 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (342786551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 155687243 - 2⁶ = 155687179 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 155687243.

It is not a weakly prime, because it can be changed into another prime (155687293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77843621 + 77843622.

It is an arithmetic number, because the mean of its divisors is an integer number (77843622).

Almost surely, 2^155687243 is an apocalyptic number.

155687243 is a deficient number, since it is larger than the sum of its proper divisors (1).

155687243 is an equidigital number, since it uses as much as digits as its factorization.

155687243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 201600, while the sum is 41.

The square root of 155687243 is about 12477.4694149094. The cubic root of 155687243 is about 537.9612689373.

The spelling of 155687243 in words is "one hundred fifty-five million, six hundred eighty-seven thousand, two hundred forty-three".