155212439 has 2 divisors, whose sum is σ = 155212440. Its totient is φ = 155212438.

The previous prime is 155212417. The next prime is 155212459. The reversal of 155212439 is 934212551.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 155212439 - 2²⁴ = 138435223 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155212459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77606219 + 77606220.

It is an arithmetic number, because the mean of its divisors is an integer number (77606220).

Almost surely, 2^155212439 is an apocalyptic number.

155212439 is a deficient number, since it is larger than the sum of its proper divisors (1).

155212439 is an equidigital number, since it uses as much as digits as its factorization.

155212439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10800, while the sum is 32.

The square root of 155212439 is about 12458.4284321900. The cubic root of 155212439 is about 537.4138332398.

The spelling of 155212439 in words is "one hundred fifty-five million, two hundred twelve thousand, four hundred thirty-nine".