155564489 has 4 divisors (see below), whose sum is σ = 155753424. Its totient is φ = 155375556.

The previous prime is 155564477. The next prime is 155564527. The reversal of 155564489 is 984465551.

155564489 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155564489 is a prime.

It is a super-2 number, since 2×155564489² = 48400620475662242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155564449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93227 + ... + 94880.

It is an arithmetic number, because the mean of its divisors is an integer number (38938356).

Almost surely, 2^155564489 is an apocalyptic number.

It is an amenable number.

155564489 is a deficient number, since it is larger than the sum of its proper divisors (188935).

155564489 is an equidigital number, since it uses as much as digits as its factorization.

155564489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188934.

The product of its digits is 864000, while the sum is 47.

The square root of 155564489 is about 12472.5494186233. The cubic root of 155564489 is about 537.8198438172.

The spelling of 155564489 in words is "one hundred fifty-five million, five hundred sixty-four thousand, four hundred eighty-nine".