2117209545 has 48 divisors (see below), whose sum is σ = 4014533952. Its totient is φ = 1023684480.

The previous prime is 2117209541. The next prime is 2117209553. The reversal of 2117209545 is 5459027112.

It is not a de Polignac number, because 2117209545 - 2² = 2117209541 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2117209541) 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, 178902 + ... + 190368.

It is an arithmetic number, because the mean of its divisors is an integer number (83636124).

Almost surely, 2^2117209545 is an apocalyptic number.

It is an amenable number.

2117209545 is a deficient number, since it is larger than the sum of its proper divisors (1897324407).

2117209545 is a wasteful number, since it uses less digits than its factorization.

2117209545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11862 (or 11859 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 36.

The square root of 2117209545 is about 46013.1453499975. The cubic root of 2117209545 is about 1284.0677770872.

The spelling of 2117209545 in words is "two billion, one hundred seventeen million, two hundred nine thousand, five hundred forty-five".