155236009 has 2 divisors, whose sum is σ = 155236010. Its totient is φ = 155236008.

The previous prime is 155236007. The next prime is 155236069. The reversal of 155236009 is 900632551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 135210384 + 20025625 = 11628^2 + 4475^2 .

It is a cyclic number.

It is not a de Polignac number, because 155236009 - 2¹ = 155236007 is a prime.

Together with 155236007, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (155236007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77618004 + 77618005.

It is an arithmetic number, because the mean of its divisors is an integer number (77618005).

Almost surely, 2^155236009 is an apocalyptic number.

It is an amenable number.

155236009 is a deficient number, since it is larger than the sum of its proper divisors (1).

155236009 is an equidigital number, since it uses as much as digits as its factorization.

155236009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8100, while the sum is 31.

The square root of 155236009 is about 12459.3743422373. The cubic root of 155236009 is about 537.4410351037.

It can be divided in two parts, 15523600 and 9, that multiplied together give a square (139712400 = 11820²).

The spelling of 155236009 in words is "one hundred fifty-five million, two hundred thirty-six thousand, nine".