2015999997 has 24 divisors (see below), whose sum is σ = 3110093280. Its totient is φ = 1157508000.

The previous prime is 2015999941. The next prime is 2016000001. The reversal of 2015999997 is 7999995102.

It is not a de Polignac number, because 2015999997 - 2¹² = 2015995901 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2015999997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2015995997) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 139254 + ... + 153047.

It is an arithmetic number, because the mean of its divisors is an integer number (129587220).

Almost surely, 2^2015999997 is an apocalyptic number.

It is an amenable number.

2015999997 is a deficient number, since it is larger than the sum of its proper divisors (1094093283).

2015999997 is a wasteful number, since it uses less digits than its factorization.

2015999997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292345 (or 292334 counting only the distinct ones).

The product of its (nonzero) digits is 4133430, while the sum is 60.

The square root of 2015999997 is about 44899.8886078796. Note that the first 3 decimals coincide. The cubic root of 2015999997 is about 1263.2719189047.

The spelling of 2015999997 in words is "two billion, fifteen million, nine hundred ninety-nine thousand, nine hundred ninety-seven".