155243419 has 2 divisors, whose sum is σ = 155243420. Its totient is φ = 155243418.

The previous prime is 155243393. The next prime is 155243423. The reversal of 155243419 is 914342551.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 155243419 - 2²⁷ = 21025691 is a prime.

It is a super-2 number, since 2×155243419² = 48201038285619122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (155247419) 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, 77621709 + 77621710.

It is an arithmetic number, because the mean of its divisors is an integer number (77621710).

Almost surely, 2^155243419 is an apocalyptic number.

155243419 is a deficient number, since it is larger than the sum of its proper divisors (1).

155243419 is an equidigital number, since it uses as much as digits as its factorization.

155243419 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21600, while the sum is 34.

The square root of 155243419 is about 12459.6717051454. The cubic root of 155243419 is about 537.4495863299.

The spelling of 155243419 in words is "one hundred fifty-five million, two hundred forty-three thousand, four hundred nineteen".