155221459 has 2 divisors, whose sum is σ = 155221460. Its totient is φ = 155221458.

The previous prime is 155221399. The next prime is 155221481. The reversal of 155221459 is 954122551.

155221459 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (954122551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 155221459 - 2¹⁷ = 155090387 is a prime.

It is not a weakly prime, because it can be changed into another prime (155221159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77610729 + 77610730.

It is an arithmetic number, because the mean of its divisors is an integer number (77610730).

Almost surely, 2^155221459 is an apocalyptic number.

155221459 is a deficient number, since it is larger than the sum of its proper divisors (1).

155221459 is an equidigital number, since it uses as much as digits as its factorization.

155221459 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18000, while the sum is 34.

The square root of 155221459 is about 12458.7904308564. The cubic root of 155221459 is about 537.4242434425.

The spelling of 155221459 in words is "one hundred fifty-five million, two hundred twenty-one thousand, four hundred fifty-nine".