2185139697 has 16 divisors (see below), whose sum is σ = 3139835328. Its totient is φ = 1343759040.

The previous prime is 2185139657. The next prime is 2185139699. The reversal of 2185139697 is 7969315812.

2185139697 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2185139697 - 2⁷ = 2185139569 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2185139699) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38947 + ... + 76727.

It is an arithmetic number, because the mean of its divisors is an integer number (196239708).

Almost surely, 2^2185139697 is an apocalyptic number.

It is an amenable number.

2185139697 is a deficient number, since it is larger than the sum of its proper divisors (954695631).

2185139697 is a wasteful number, since it uses less digits than its factorization.

2185139697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39280.

The product of its digits is 816480, while the sum is 51.

The square root of 2185139697 is about 46745.4778240634. The cubic root of 2185139697 is about 1297.6564675559.

The spelling of 2185139697 in words is "two billion, one hundred eighty-five million, one hundred thirty-nine thousand, six hundred ninety-seven".