15780113 has 2 divisors, whose sum is σ = 15780114. Its totient is φ = 15780112.

The previous prime is 15780091. The next prime is 15780133. The reversal of 15780113 is 31108751.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13786369 + 1993744 = 3713^2 + 1412^2 .

It is an emirp because it is prime and its reverse (31108751) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15780113 - 2⁶ = 15780049 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (15780133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7890056 + 7890057.

It is an arithmetic number, because the mean of its divisors is an integer number (7890057).

Almost surely, 2^15780113 is an apocalyptic number.

It is an amenable number.

15780113 is a deficient number, since it is larger than the sum of its proper divisors (1).

15780113 is an equidigital number, since it uses as much as digits as its factorization.

15780113 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 840, while the sum is 26.

The square root of 15780113 is about 3972.4190363052. The cubic root of 15780113 is about 250.8245468336.

Adding to 15780113 its reverse (31108751), we get a palindrome (46888864).

The spelling of 15780113 in words is "fifteen million, seven hundred eighty thousand, one hundred thirteen".