155564137 has 2 divisors, whose sum is σ = 155564138. Its totient is φ = 155564136.

The previous prime is 155564119. The next prime is 155564141. The reversal of 155564137 is 731465551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 152670736 + 2893401 = 12356^2 + 1701^2 .

It is an emirp because it is prime and its reverse (731465551) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155564137 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 155564096 and 155564105.

It is not a weakly prime, because it can be changed into another prime (155564117) 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, 77782068 + 77782069.

It is an arithmetic number, because the mean of its divisors is an integer number (77782069).

Almost surely, 2^155564137 is an apocalyptic number.

It is an amenable number.

155564137 is a deficient number, since it is larger than the sum of its proper divisors (1).

155564137 is an equidigital number, since it uses as much as digits as its factorization.

155564137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 63000, while the sum is 37.

The square root of 155564137 is about 12472.5353076269. The cubic root of 155564137 is about 537.8194381703.

The spelling of 155564137 in words is "one hundred fifty-five million, five hundred sixty-four thousand, one hundred thirty-seven".