155609039 has 2 divisors, whose sum is σ = 155609040. Its totient is φ = 155609038.

The previous prime is 155609033. The next prime is 155609059. The reversal of 155609039 is 930906551.

It is a weak prime.

It is an emirp because it is prime and its reverse (930906551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 155609039 - 2²⁰ = 154560463 is a prime.

It is a Sophie Germain prime.

It is equal to p_8741891 and since 155609039 and 8741891 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 155608993 and 155609011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155609033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77804519 + 77804520.

It is an arithmetic number, because the mean of its divisors is an integer number (77804520).

Almost surely, 2^155609039 is an apocalyptic number.

155609039 is a deficient number, since it is larger than the sum of its proper divisors (1).

155609039 is an equidigital number, since it uses as much as digits as its factorization.

155609039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36450, while the sum is 38.

The square root of 155609039 is about 12474.3352127478. The cubic root of 155609039 is about 537.8711785560.

The spelling of 155609039 in words is "one hundred fifty-five million, six hundred nine thousand, thirty-nine".