2015423231 has 4 divisors (see below), whose sum is σ = 2103050352. Its totient is φ = 1927796112.

The previous prime is 2015423227. The next prime is 2015423251. The reversal of 2015423231 is 1323245102.

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 2015423231 - 2² = 2015423227 is a prime.

It is a super-2 number, since 2×2015423231² = 8123861600108958722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 87627097 = 2015423231 / (2 + 0 + 1 + 5 + 4 + 2 + 3 + 2 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2015423197 and 2015423206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2015423251) 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, 43813526 + ... + 43813571.

It is an arithmetic number, because the mean of its divisors is an integer number (525762588).

Almost surely, 2^2015423231 is an apocalyptic number.

2015423231 is a deficient number, since it is larger than the sum of its proper divisors (87627121).

2015423231 is an equidigital number, since it uses as much as digits as its factorization.

2015423231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87627120.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 2015423231 is about 44893.4653485337. The cubic root of 2015423231 is about 1263.1514358048.

Adding to 2015423231 its reverse (1323245102), we get a palindrome (3338668333).

The spelling of 2015423231 in words is "two billion, fifteen million, four hundred twenty-three thousand, two hundred thirty-one".