2015920217 has 2 divisors, whose sum is σ = 2015920218. Its totient is φ = 2015920216.

The previous prime is 2015920177. The next prime is 2015920279. The reversal of 2015920217 is 7120295102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2015920201 + 16 = 44899^2 + 4^2 .

It is a cyclic number.

It is not a de Polignac number, because 2015920217 - 2²⁰ = 2014871641 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2015920217.

It is not a weakly prime, because it can be changed into another prime (2015920817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1007960108 + 1007960109.

It is an arithmetic number, because the mean of its divisors is an integer number (1007960109).

Almost surely, 2^2015920217 is an apocalyptic number.

It is an amenable number.

2015920217 is a deficient number, since it is larger than the sum of its proper divisors (1).

2015920217 is an equidigital number, since it uses as much as digits as its factorization.

2015920217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 2015920217 is about 44899.0001781777. Note that the first 3 decimals coincide. The cubic root of 2015920217 is about 1263.2552546911.

The spelling of 2015920217 in words is "two billion, fifteen million, nine hundred twenty thousand, two hundred seventeen".