15122001 has 4 divisors (see below), whose sum is σ = 20162672. Its totient is φ = 10081332.

The previous prime is 15121991. The next prime is 15122033. The reversal of 15122001 is 10022151.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 15122001 - 2²¹ = 13024849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15122501) 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, 2520331 + ... + 2520336.

It is an arithmetic number, because the mean of its divisors is an integer number (5040668).

Almost surely, 2^15122001 is an apocalyptic number.

It is an amenable number.

15122001 is a deficient number, since it is larger than the sum of its proper divisors (5040671).

15122001 is an equidigital number, since it uses as much as digits as its factorization.

15122001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5040670.

The product of its (nonzero) digits is 20, while the sum is 12.

The square root of 15122001 is about 3888.7017113685. The cubic root of 15122001 is about 247.2880258299.

Adding to 15122001 its reverse (10022151), we get a palindrome (25144152).

The spelling of 15122001 in words is "fifteen million, one hundred twenty-two thousand, one".