155894489 has 2 divisors, whose sum is σ = 155894490. Its totient is φ = 155894488.

The previous prime is 155894429. The next prime is 155894491. The reversal of 155894489 is 984498551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 128436889 + 27457600 = 11333^2 + 5240^2 .

It is an emirp because it is prime and its reverse (984498551) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155894489 is a prime.

It is a super-2 number, since 2×155894489² = 48606183401142242, which contains 22 as substring.

Together with 155894491, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 155894489.

It is not a weakly prime, because it can be changed into another prime (155894419) 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, 77947244 + 77947245.

It is an arithmetic number, because the mean of its divisors is an integer number (77947245).

Almost surely, 2^155894489 is an apocalyptic number.

It is an amenable number.

155894489 is a deficient number, since it is larger than the sum of its proper divisors (1).

155894489 is an equidigital number, since it uses as much as digits as its factorization.

155894489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2073600, while the sum is 53.

The square root of 155894489 is about 12485.7714619482. The cubic root of 155894489 is about 538.1998688482.

The spelling of 155894489 in words is "one hundred fifty-five million, eight hundred ninety-four thousand, four hundred eighty-nine".