2161407617 has 4 divisors (see below), whose sum is σ = 2162646576. Its totient is φ = 2160168660.

The previous prime is 2161407607. The next prime is 2161407623. The reversal of 2161407617 is 7167041612.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2161407617 - 2⁶ = 2161407553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2161407607) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 616859 + ... + 620352.

It is an arithmetic number, because the mean of its divisors is an integer number (540661644).

Almost surely, 2^2161407617 is an apocalyptic number.

It is an amenable number.

2161407617 is a deficient number, since it is larger than the sum of its proper divisors (1238959).

2161407617 is a wasteful number, since it uses less digits than its factorization.

2161407617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1238958.

The product of its (nonzero) digits is 14112, while the sum is 35.

The square root of 2161407617 is about 46490.9412359010. The cubic root of 2161407617 is about 1292.9415510907.

The spelling of 2161407617 in words is "two billion, one hundred sixty-one million, four hundred seven thousand, six hundred seventeen".