15551201 has 4 divisors (see below), whose sum is σ = 15770304. Its totient is φ = 15332100.

The previous prime is 15551191. The next prime is 15551203. The reversal of 15551201 is 10215551.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 10215551 = 71 ⋅143881.

It is a cyclic number.

It is not a de Polignac number, because 15551201 - 2¹⁴ = 15534817 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (15551203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109445 + ... + 109586.

It is an arithmetic number, because the mean of its divisors is an integer number (3942576).

Almost surely, 2^15551201 is an apocalyptic number.

It is an amenable number.

15551201 is a deficient number, since it is larger than the sum of its proper divisors (219103).

15551201 is an equidigital number, since it uses as much as digits as its factorization.

15551201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219102.

The product of its (nonzero) digits is 250, while the sum is 20.

The square root of 15551201 is about 3943.5011094204. The cubic root of 15551201 is about 249.6057840352.

Adding to 15551201 its reverse (10215551), we get a palindrome (25766752).

The spelling of 15551201 in words is "fifteen million, five hundred fifty-one thousand, two hundred one".