15222989 has 4 divisors (see below), whose sum is σ = 15577056. Its totient is φ = 14868924.

The previous prime is 15222983. The next prime is 15223027. The reversal of 15222989 is 98922251.

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, and also an emirpimes, since its reverse is a distinct semiprime: 98922251 = 673 ⋅146987.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15222989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15222983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 176969 + ... + 177054.

It is an arithmetic number, because the mean of its divisors is an integer number (3894264).

Almost surely, 2^15222989 is an apocalyptic number.

It is an amenable number.

15222989 is a deficient number, since it is larger than the sum of its proper divisors (354067).

15222989 is an equidigital number, since it uses as much as digits as its factorization.

15222989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354066.

The product of its digits is 25920, while the sum is 38.

The square root of 15222989 is about 3901.6649010390. The cubic root of 15222989 is about 247.8372859558.

The spelling of 15222989 in words is "fifteen million, two hundred twenty-two thousand, nine hundred eighty-nine".