15748981 has 2 divisors, whose sum is σ = 15748982. Its totient is φ = 15748980.

The previous prime is 15748979. The next prime is 15749011. The reversal of 15748981 is 18984751.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8213956 + 7535025 = 2866^2 + 2745^2 .

It is an emirp because it is prime and its reverse (18984751) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15748981 - 2¹ = 15748979 is a prime.

It is a super-2 number, since 2×15748981² = 496060805076722, which contains 22 as substring.

Together with 15748979, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15748921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7874490 + 7874491.

It is an arithmetic number, because the mean of its divisors is an integer number (7874491).

Almost surely, 2^15748981 is an apocalyptic number.

It is an amenable number.

15748981 is a deficient number, since it is larger than the sum of its proper divisors (1).

15748981 is an equidigital number, since it uses as much as digits as its factorization.

15748981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 80640, while the sum is 43.

The square root of 15748981 is about 3968.4985825876. The cubic root of 15748981 is about 250.6594907580.

The spelling of 15748981 in words is "fifteen million, seven hundred forty-eight thousand, nine hundred eighty-one".