2015636551 has 4 divisors (see below), whose sum is σ = 2017385872. Its totient is φ = 2013887232.

The previous prime is 2015636549. The next prime is 2015636593. The reversal of 2015636551 is 1556365102.

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

It is a cyclic number.

It is not a de Polignac number, because 2015636551 - 2¹ = 2015636549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2015636251) 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, 872931 + ... + 875236.

It is an arithmetic number, because the mean of its divisors is an integer number (504346468).

Almost surely, 2^2015636551 is an apocalyptic number.

2015636551 is a deficient number, since it is larger than the sum of its proper divisors (1749321).

2015636551 is a wasteful number, since it uses less digits than its factorization.

2015636551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1749320.

The product of its (nonzero) digits is 27000, while the sum is 34.

The square root of 2015636551 is about 44895.8411325593. The cubic root of 2015636551 is about 1263.1959998041.

The spelling of 2015636551 in words is "two billion, fifteen million, six hundred thirty-six thousand, five hundred fifty-one".