155002989 has 4 divisors (see below), whose sum is σ = 206670656. Its totient is φ = 103335324.

The previous prime is 155002973. The next prime is 155003077. The reversal of 155002989 is 989200551.

155002989 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 not a de Polignac number, because 155002989 - 2⁴ = 155002973 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155002909) 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, 25833829 + ... + 25833834.

It is an arithmetic number, because the mean of its divisors is an integer number (51667664).

Almost surely, 2^155002989 is an apocalyptic number.

It is an amenable number.

155002989 is a deficient number, since it is larger than the sum of its proper divisors (51667667).

155002989 is an equidigital number, since it uses as much as digits as its factorization.

155002989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51667666.

The product of its (nonzero) digits is 32400, while the sum is 39.

The square root of 155002989 is about 12450.0196385387. The cubic root of 155002989 is about 537.1719883685.

The spelling of 155002989 in words is "one hundred fifty-five million, two thousand, nine hundred eighty-nine".