15720361 has 2 divisors, whose sum is σ = 15720362. Its totient is φ = 15720360.

The previous prime is 15720281. The next prime is 15720377. The reversal of 15720361 is 16302751.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12033961 + 3686400 = 3469^2 + 1920^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15720361 is a prime.

It is not a weakly prime, because it can be changed into another prime (15729361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7860180 + 7860181.

It is an arithmetic number, because the mean of its divisors is an integer number (7860181).

Almost surely, 2^15720361 is an apocalyptic number.

It is an amenable number.

15720361 is a deficient number, since it is larger than the sum of its proper divisors (1).

15720361 is an equidigital number, since it uses as much as digits as its factorization.

15720361 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 15720361 is about 3964.8910451613. The cubic root of 15720361 is about 250.5075608306.

The spelling of 15720361 in words is "fifteen million, seven hundred twenty thousand, three hundred sixty-one".