15145813 has 4 divisors (see below), whose sum is σ = 15171948. Its totient is φ = 15119680.

The previous prime is 15145807. The next prime is 15145817. The reversal of 15145813 is 31854151.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8054244 + 7091569 = 2838^2 + 2663^2 .

It is a cyclic number.

It is not a de Polignac number, because 15145813 - 2¹³ = 15137621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15145817) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12178 + ... + 13363.

It is an arithmetic number, because the mean of its divisors is an integer number (3792987).

Almost surely, 2^15145813 is an apocalyptic number.

It is an amenable number.

15145813 is a deficient number, since it is larger than the sum of its proper divisors (26135).

15145813 is an equidigital number, since it uses as much as digits as its factorization.

15145813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26134.

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

The square root of 15145813 is about 3891.7621972572. The cubic root of 15145813 is about 247.4177558928.

Adding to 15145813 its reverse (31854151), we get a palindrome (46999964).

The spelling of 15145813 in words is "fifteen million, one hundred forty-five thousand, eight hundred thirteen".