15494681 has 2 divisors, whose sum is σ = 15494682. Its totient is φ = 15494680.

The previous prime is 15494653. The next prime is 15494693. The reversal of 15494681 is 18649451.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13579225 + 1915456 = 3685^2 + 1384^2 .

It is a cyclic number.

It is not a de Polignac number, because 15494681 - 2¹⁴ = 15478297 is a prime.

It is a super-2 number, since 2×15494681² = 480170278583522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (15394681) by changing a digit.

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

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7747340 + 7747341.

It is an arithmetic number, because the mean of its divisors is an integer number (7747341).

Almost surely, 2^15494681 is an apocalyptic number.

It is an amenable number.

15494681 is a deficient number, since it is larger than the sum of its proper divisors (1).

15494681 is an equidigital number, since it uses as much as digits as its factorization.

15494681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34560, while the sum is 38.

The square root of 15494681 is about 3936.3283653679. The cubic root of 15494681 is about 249.3030240371.

The spelling of 15494681 in words is "fifteen million, four hundred ninety-four thousand, six hundred eighty-one".