15381623 has 2 divisors, whose sum is σ = 15381624. Its totient is φ = 15381622.

The previous prime is 15381599. The next prime is 15381631. The reversal of 15381623 is 32618351.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 15381623 - 2⁶ = 15381559 is a prime.

It is a super-2 number, since 2×15381623² = 473188652228258, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15381523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7690811 + 7690812.

It is an arithmetic number, because the mean of its divisors is an integer number (7690812).

Almost surely, 2^15381623 is an apocalyptic number.

15381623 is a deficient number, since it is larger than the sum of its proper divisors (1).

15381623 is an equidigital number, since it uses as much as digits as its factorization.

15381623 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 29.

The square root of 15381623 is about 3921.9412285245. The cubic root of 15381623 is about 248.6951910759.

Adding to 15381623 its reverse (32618351), we get a palindrome (47999974).

The spelling of 15381623 in words is "fifteen million, three hundred eighty-one thousand, six hundred twenty-three".