15217481 has 2 divisors, whose sum is σ = 15217482. Its totient is φ = 15217480.

The previous prime is 15217459. The next prime is 15217483. The reversal of 15217481 is 18471251.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13987600 + 1229881 = 3740^2 + 1109^2 .

It is a cyclic number.

It is not a de Polignac number, because 15217481 - 2⁶ = 15217417 is a prime.

It is a super-2 number, since 2×15217481² = 463143455970722, which contains 22 as substring.

Together with 15217483, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (15217483) 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, 7608740 + 7608741.

It is an arithmetic number, because the mean of its divisors is an integer number (7608741).

Almost surely, 2^15217481 is an apocalyptic number.

It is an amenable number.

15217481 is a deficient number, since it is larger than the sum of its proper divisors (1).

15217481 is an equidigital number, since it uses as much as digits as its factorization.

15217481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2240, while the sum is 29.

The square root of 15217481 is about 3900.9589846601. The cubic root of 15217481 is about 247.8073914227.

The spelling of 15217481 in words is "fifteen million, two hundred seventeen thousand, four hundred eighty-one".