15642201 has 8 divisors (see below), whose sum is σ = 20972224. Its totient is φ = 10370160.

The previous prime is 15642181. The next prime is 15642203. The reversal of 15642201 is 10224651.

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

It is not a de Polignac number, because 15642201 - 2¹³ = 15634009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15642203) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13861 + ... + 14946.

It is an arithmetic number, because the mean of its divisors is an integer number (2621528).

Almost surely, 2^15642201 is an apocalyptic number.

It is an amenable number.

15642201 is a deficient number, since it is larger than the sum of its proper divisors (5330023).

15642201 is a wasteful number, since it uses less digits than its factorization.

15642201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28991.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 15642201 is about 3955.0222502535. The cubic root of 15642201 is about 250.0917050233.

Adding to 15642201 its reverse (10224651), we get a palindrome (25866852).

The spelling of 15642201 in words is "fifteen million, six hundred forty-two thousand, two hundred one".