15222251 has 8 divisors (see below), whose sum is σ = 17328384. Its totient is φ = 13236520.

The previous prime is 15222247. The next prime is 15222257.

It is a happy number.

15222251 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 15222251 - 2² = 15222247 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15222257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29831 + ... + 30336.

It is an arithmetic number, because the mean of its divisors is an integer number (2166048).

Almost surely, 2^15222251 is an apocalyptic number.

15222251 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

15222251 is a deficient number, since it is larger than the sum of its proper divisors (2106133).

15222251 is a wasteful number, since it uses less digits than its factorization.

15222251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60201.

The product of its digits is 400, while the sum is 20.

The square root of 15222251 is about 3901.5703248820. The cubic root of 15222251 is about 247.8332808975.

It can be divided in two parts, 1522 and 2251, that added together give a palindrome (3773).

The spelling of 15222251 in words is "fifteen million, two hundred twenty-two thousand, two hundred fifty-one".