15213145 has 4 divisors (see below), whose sum is σ = 18255780. Its totient is φ = 12170512.

The previous prime is 15213137. The next prime is 15213169. The reversal of 15213145 is 54131251.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54131251 = 241 ⋅224611.

It can be written as a sum of positive squares in 2 ways, for example, as 10478169 + 4734976 = 3237^2 + 2176^2 .

It is a cyclic number.

It is not a de Polignac number, because 15213145 - 2³ = 15213137 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1521310 + ... + 1521319.

It is an arithmetic number, because the mean of its divisors is an integer number (4563945).

Almost surely, 2^15213145 is an apocalyptic number.

It is an amenable number.

15213145 is a deficient number, since it is larger than the sum of its proper divisors (3042635).

15213145 is an equidigital number, since it uses as much as digits as its factorization.

15213145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3042634.

The product of its digits is 600, while the sum is 22.

The square root of 15213145 is about 3900.4031842875. The cubic root of 15213145 is about 247.7838528156.

Adding to 15213145 its reverse (54131251), we get a palindrome (69344396).

The spelling of 15213145 in words is "fifteen million, two hundred thirteen thousand, one hundred forty-five".