15813145 has 8 divisors (see below), whose sum is σ = 20092104. Its totient is φ = 11906304.

The previous prime is 15813143. The next prime is 15813157. The reversal of 15813145 is 54131851.

15813145 = 1253² + 1254² + ... + 1262².

It can be written as a sum of positive squares in 4 ways, for example, as 4717584 + 11095561 = 2172^2 + 3331^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 15813145 - 2¹ = 15813143 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15813143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 92934 + ... + 93103.

It is an arithmetic number, because the mean of its divisors is an integer number (2511513).

Almost surely, 2^15813145 is an apocalyptic number.

It is an amenable number.

15813145 is a deficient number, since it is larger than the sum of its proper divisors (4278959).

15813145 is a wasteful number, since it uses less digits than its factorization.

15813145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186059.

The product of its digits is 2400, while the sum is 28.

The square root of 15813145 is about 3976.5745309248. The cubic root of 15813145 is about 250.9994391611. Note that the first 3 decimals are identical.

Adding to 15813145 its reverse (54131851), we get a palindrome (69944996).

The spelling of 15813145 in words is "fifteen million, eight hundred thirteen thousand, one hundred forty-five".