15221197 has 2 divisors, whose sum is σ = 15221198. Its totient is φ = 15221196.

The previous prime is 15221179. The next prime is 15221203. The reversal of 15221197 is 79112251.

Together with previous prime (15221179) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14243076 + 978121 = 3774^2 + 989^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15221197 is a prime.

It is a super-2 number, since 2×15221197² = 463369676225618, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15221597) 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 as a sum of consecutive naturals, namely, 7610598 + 7610599.

It is an arithmetic number, because the mean of its divisors is an integer number (7610599).

Almost surely, 2^15221197 is an apocalyptic number.

It is an amenable number.

15221197 is a deficient number, since it is larger than the sum of its proper divisors (1).

15221197 is an equidigital number, since it uses as much as digits as its factorization.

15221197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1260, while the sum is 28.

The square root of 15221197 is about 3901.4352487258. The cubic root of 15221197 is about 247.8275607118.

The spelling of 15221197 in words is "fifteen million, two hundred twenty-one thousand, one hundred ninety-seven".