15222861 has 6 divisors (see below), whose sum is σ = 21988590. Its totient is φ = 10148568.

The previous prime is 15222839. The next prime is 15222887. The reversal of 15222861 is 16822251.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 14402025 + 820836 = 3795^2 + 906^2 .

It is not a de Polignac number, because 15222861 - 2¹³ = 15214669 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15222761) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 845706 + ... + 845723.

It is an arithmetic number, because the mean of its divisors is an integer number (3664765).

Almost surely, 2^15222861 is an apocalyptic number.

It is an amenable number.

15222861 is a deficient number, since it is larger than the sum of its proper divisors (6765729).

15222861 is a wasteful number, since it uses less digits than its factorization.

15222861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1691435 (or 1691432 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 15222861 is about 3901.6484977507. The cubic root of 15222861 is about 247.8365913208.

The spelling of 15222861 in words is "fifteen million, two hundred twenty-two thousand, eight hundred sixty-one".