155783 has 2 divisors, whose sum is σ = 155784. Its totient is φ = 155782.

The previous prime is 155777. The next prime is 155797. The reversal of 155783 is 387551.

It is a weak prime.

It is an emirp because it is prime and its reverse (387551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 155783 - 2⁶ = 155719 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77891 + 77892.

It is an arithmetic number, because the mean of its divisors is an integer number (77892).

2¹⁵⁵⁷⁸³ is an apocalyptic number.

155783 is a deficient number, since it is larger than the sum of its proper divisors (1).

155783 is an equidigital number, since it uses as much as digits as its factorization.

155783 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4200, while the sum is 29.

The square root of 155783 is about 394.6935520122. The cubic root of 155783 is about 53.8071539157.

The spelling of 155783 in words is "one hundred fifty-five thousand, seven hundred eighty-three".