15120001 has 4 divisors (see below), whose sum is σ = 16283092. Its totient is φ = 13956912.

The previous prime is 15119977. The next prime is 15120011. The reversal of 15120001 is 10002151.

It is a happy number.

15120001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10002151 = 19 ⋅526429.

It can be written as a sum of positive squares in 2 ways, for example, as 672400 + 14447601 = 820^2 + 3801^2 .

It is a cyclic number.

It is not a de Polignac number, because 15120001 - 2⁵ = 15119969 is a prime.

It is a super-2 number, since 2×15120001² = 457228860480002, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 15120001.

It is not an unprimeable number, because it can be changed into a prime (15120011) 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, 581526 + ... + 581551.

It is an arithmetic number, because the mean of its divisors is an integer number (4070773).

Almost surely, 2^15120001 is an apocalyptic number.

It is an amenable number.

15120001 is a deficient number, since it is larger than the sum of its proper divisors (1163091).

15120001 is a wasteful number, since it uses less digits than its factorization.

15120001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1163090.

The product of its (nonzero) digits is 10, while the sum is 10.

The square root of 15120001 is about 3888.4445476308. Note that the first 3 decimals coincide. The cubic root of 15120001 is about 247.2771234399.

Adding to 15120001 its reverse (10002151), we get a palindrome (25122152).

The spelling of 15120001 in words is "fifteen million, one hundred twenty thousand, one".