2115172647 has 48 divisors (see below), whose sum is σ = 3554783232. Its totient is φ = 1186954560.

The previous prime is 2115172639. The next prime is 2115172651. The reversal of 2115172647 is 7462715112.

2115172647 is a `hidden beast` number, since 2 + 1 + 1 + 5 + 1 + 7 + 2 + 647 = 666.

It is not a de Polignac number, because 2115172647 - 2³ = 2115172639 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2115172447) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1945338 + ... + 1946424.

It is an arithmetic number, because the mean of its divisors is an integer number (74057984).

Almost surely, 2^2115172647 is an apocalyptic number.

2115172647 is a deficient number, since it is larger than the sum of its proper divisors (1439610585).

2115172647 is a wasteful number, since it uses less digits than its factorization.

2115172647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1628 (or 1625 counting only the distinct ones).

The product of its digits is 23520, while the sum is 36.

The square root of 2115172647 is about 45991.0061533774. The cubic root of 2115172647 is about 1283.6558584356.

Adding to 2115172647 its reverse (7462715112), we get a palindrome (9577887759).

The spelling of 2115172647 in words is "two billion, one hundred fifteen million, one hundred seventy-two thousand, six hundred forty-seven".