15551313251 has 8 divisors (see below), whose sum is σ = 16005729024. Its totient is φ = 15103436040.

The previous prime is 15551313247. The next prime is 15551313259. The reversal of 15551313251 is 15231315551.

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

It is a cyclic number.

It is not a de Polignac number, because 15551313251 - 2² = 15551313247 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15551313259) 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, 1629815 + ... + 1639328.

It is an arithmetic number, because the mean of its divisors is an integer number (2000716128).

Almost surely, 2^15551313251 is an apocalyptic number.

15551313251 is a deficient number, since it is larger than the sum of its proper divisors (454415773).

15551313251 is an equidigital number, since it uses as much as digits as its factorization.

15551313251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3269281.

The product of its digits is 11250, while the sum is 32.

The spelling of 15551313251 in words is "fifteen billion, five hundred fifty-one million, three hundred thirteen thousand, two hundred fifty-one".