15682981 has 2 divisors, whose sum is σ = 15682982. Its totient is φ = 15682980.

The previous prime is 15682949. The next prime is 15683009. The reversal of 15682981 is 18928651.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8208225 + 7474756 = 2865^2 + 2734^2 .

It is a cyclic number.

It is not a de Polignac number, because 15682981 - 2⁵ = 15682949 is a prime.

It is a super-2 number, since 2×15682981² = 491911786092722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15682181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7841490 + 7841491.

It is an arithmetic number, because the mean of its divisors is an integer number (7841491).

Almost surely, 2^15682981 is an apocalyptic number.

It is an amenable number.

15682981 is a deficient number, since it is larger than the sum of its proper divisors (1).

15682981 is an equidigital number, since it uses as much as digits as its factorization.

15682981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34560, while the sum is 40.

The square root of 15682981 is about 3960.1743648481. The cubic root of 15682981 is about 250.3088502889.

The spelling of 15682981 in words is "fifteen million, six hundred eighty-two thousand, nine hundred eighty-one".