15222047 has 4 divisors (see below), whose sum is σ = 15233760. Its totient is φ = 15210336.

The previous prime is 15222041. The next prime is 15222049. The reversal of 15222047 is 74022251.

It is a happy number.

15222047 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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15222047 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 (15222041) 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, 3623 + ... + 6600.

It is an arithmetic number, because the mean of its divisors is an integer number (3808440).

Almost surely, 2^15222047 is an apocalyptic number.

15222047 is a deficient number, since it is larger than the sum of its proper divisors (11713).

15222047 is a wasteful number, since it uses less digits than its factorization.

15222047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11712.

The product of its (nonzero) digits is 1120, while the sum is 23.

The square root of 15222047 is about 3901.5441814748. The cubic root of 15222047 is about 247.8321737854.

Adding to 15222047 its reverse (74022251), we get a palindrome (89244298).

The spelling of 15222047 in words is "fifteen million, two hundred twenty-two thousand, forty-seven".