15222161 has 4 divisors (see below), whose sum is σ = 15241524. Its totient is φ = 15202800.

The previous prime is 15222143. The next prime is 15222197. The reversal of 15222161 is 16122251.

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 5612161 + 9610000 = 2369^2 + 3100^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15222161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15222101) 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, 8450 + ... + 10091.

It is an arithmetic number, because the mean of its divisors is an integer number (3810381).

Almost surely, 2^15222161 is an apocalyptic number.

It is an amenable number.

15222161 is a deficient number, since it is larger than the sum of its proper divisors (19363).

15222161 is an equidigital number, since it uses as much as digits as its factorization.

15222161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19362.

The product of its digits is 240, while the sum is 20.

The square root of 15222161 is about 3901.5587910475. The cubic root of 15222161 is about 247.8327924669.

The spelling of 15222161 in words is "fifteen million, two hundred twenty-two thousand, one hundred sixty-one".