15531445201 has 4 divisors (see below), whose sum is σ = 15533378100. Its totient is φ = 15529512304.

The previous prime is 15531445187. The next prime is 15531445211. The reversal of 15531445201 is 10254413551.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4844020801 + 10687424400 = 69599^2 + 103380^2 .

It is a cyclic number.

It is not a de Polignac number, because 15531445201 - 2⁵ = 15531445169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15531445211) 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, 954346 + ... + 970483.

It is an arithmetic number, because the mean of its divisors is an integer number (3883344525).

Almost surely, 2^15531445201 is an apocalyptic number.

It is an amenable number.

15531445201 is a deficient number, since it is larger than the sum of its proper divisors (1932899).

15531445201 is an equidigital number, since it uses as much as digits as its factorization.

15531445201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1932898.

The product of its (nonzero) digits is 12000, while the sum is 31.

Adding to 15531445201 its reverse (10254413551), we get a palindrome (25785858752).

The spelling of 15531445201 in words is "fifteen billion, five hundred thirty-one million, four hundred forty-five thousand, two hundred one".