155643013 has 2 divisors, whose sum is σ = 155643014. Its totient is φ = 155643012.

The previous prime is 155642989. The next prime is 155643017. The reversal of 155643013 is 310346551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 153338689 + 2304324 = 12383^2 + 1518^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155643013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155643017) 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, 77821506 + 77821507.

It is an arithmetic number, because the mean of its divisors is an integer number (77821507).

Almost surely, 2^155643013 is an apocalyptic number.

It is an amenable number.

155643013 is a deficient number, since it is larger than the sum of its proper divisors (1).

155643013 is an equidigital number, since it uses as much as digits as its factorization.

155643013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 155643013 is about 12475.6968943623. The cubic root of 155643013 is about 537.9103200390.

Adding to 155643013 its reverse (310346551), we get a palindrome (465989564).

The spelling of 155643013 in words is "one hundred fifty-five million, six hundred forty-three thousand, thirteen".