15381913 has 2 divisors, whose sum is σ = 15381914. Its totient is φ = 15381912.

The previous prime is 15381911. The next prime is 15381967. The reversal of 15381913 is 31918351.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14722569 + 659344 = 3837^2 + 812^2 .

It is a cyclic number.

It is not a de Polignac number, because 15381913 - 2¹ = 15381911 is a prime.

Together with 15381911, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (15381911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7690956 + 7690957.

It is an arithmetic number, because the mean of its divisors is an integer number (7690957).

Almost surely, 2^15381913 is an apocalyptic number.

It is an amenable number.

15381913 is a deficient number, since it is larger than the sum of its proper divisors (1).

15381913 is an equidigital number, since it uses as much as digits as its factorization.

15381913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3240, while the sum is 31.

The square root of 15381913 is about 3921.9781998374. The cubic root of 15381913 is about 248.6967540048.

The spelling of 15381913 in words is "fifteen million, three hundred eighty-one thousand, nine hundred thirteen".