155242643 has 2 divisors, whose sum is σ = 155242644. Its totient is φ = 155242642.

The previous prime is 155242627. The next prime is 155242669. The reversal of 155242643 is 346242551.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 155242643 - 2⁴ = 155242627 is a prime.

It is not a weakly prime, because it can be changed into another prime (155241643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77621321 + 77621322.

It is an arithmetic number, because the mean of its divisors is an integer number (77621322).

Almost surely, 2^155242643 is an apocalyptic number.

155242643 is a deficient number, since it is larger than the sum of its proper divisors (1).

155242643 is an equidigital number, since it uses as much as digits as its factorization.

155242643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28800, while the sum is 32.

The square root of 155242643 is about 12459.6405646391. The cubic root of 155242643 is about 537.4486908297.

The spelling of 155242643 in words is "one hundred fifty-five million, two hundred forty-two thousand, six hundred forty-three".