2015131623 has 4 divisors (see below), whose sum is σ = 2686842168. Its totient is φ = 1343421080.

The previous prime is 2015131579. The next prime is 2015131631. The reversal of 2015131623 is 3261315102.

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 2015131623 - 2⁸ = 2015131367 is a prime.

It is a super-2 number, since 2×2015131623² = 8121510916029228258, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2015131593 and 2015131602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2015131633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 335855268 + ... + 335855273.

It is an arithmetic number, because the mean of its divisors is an integer number (671710542).

Almost surely, 2^2015131623 is an apocalyptic number.

2015131623 is a deficient number, since it is larger than the sum of its proper divisors (671710545).

2015131623 is an equidigital number, since it uses as much as digits as its factorization.

2015131623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 671710544.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 2015131623 is about 44890.2174532492. The cubic root of 2015131623 is about 1263.0905118221.

Adding to 2015131623 its reverse (3261315102), we get a palindrome (5276446725).

The spelling of 2015131623 in words is "two billion, fifteen million, one hundred thirty-one thousand, six hundred twenty-three".