915122189 has 4 divisors (see below), whose sum is σ = 968952924. Its totient is φ = 861291456.

The previous prime is 915122171. The next prime is 915122191. The reversal of 915122189 is 981221519.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 639230089 + 275892100 = 25283^2 + 16610^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-915122189 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 (915122149) 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, 26915342 + ... + 26915375.

It is an arithmetic number, because the mean of its divisors is an integer number (242238231).

Almost surely, 2^915122189 is an apocalyptic number.

It is an amenable number.

915122189 is a deficient number, since it is larger than the sum of its proper divisors (53830735).

915122189 is a wasteful number, since it uses less digits than its factorization.

915122189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53830734.

The product of its digits is 12960, while the sum is 38.

The square root of 915122189 is about 30250.9865789531. The cubic root of 915122189 is about 970.8669009930.

The spelling of 915122189 in words is "nine hundred fifteen million, one hundred twenty-two thousand, one hundred eighty-nine".