15401681 has 2 divisors, whose sum is σ = 15401682. Its totient is φ = 15401680.

The previous prime is 15401669. The next prime is 15401689. The reversal of 15401681 is 18610451.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11730625 + 3671056 = 3425^2 + 1916^2 .

It is a cyclic number.

It is not a de Polignac number, because 15401681 - 2¹⁴ = 15385297 is a prime.

It is a super-2 number, since 2×15401681² = 474423555251522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 15401681.

It is not a weakly prime, because it can be changed into another prime (15401689) 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, 7700840 + 7700841.

It is an arithmetic number, because the mean of its divisors is an integer number (7700841).

Almost surely, 2^15401681 is an apocalyptic number.

It is an amenable number.

15401681 is a deficient number, since it is larger than the sum of its proper divisors (1).

15401681 is an equidigital number, since it uses as much as digits as its factorization.

15401681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 960, while the sum is 26.

The square root of 15401681 is about 3924.4975474575. The cubic root of 15401681 is about 248.8032455903.

The spelling of 15401681 in words is "fifteen million, four hundred one thousand, six hundred eighty-one".