1939566161 has 16 divisors (see below), whose sum is σ = 2121052416. Its totient is φ = 1762839936.

The previous prime is 1939566157. The next prime is 1939566163. The reversal of 1939566161 is 1616659391.

It is not a de Polignac number, because 1939566161 - 2² = 1939566157 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1939566163) 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, 334856 + ... + 340598.

It is an arithmetic number, because the mean of its divisors is an integer number (132565776).

Almost surely, 2^1939566161 is an apocalyptic number.

It is an amenable number.

1939566161 is a deficient number, since it is larger than the sum of its proper divisors (181486255).

1939566161 is a wasteful number, since it uses less digits than its factorization.

1939566161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6152.

The product of its digits is 262440, while the sum is 47.

The square root of 1939566161 is about 44040.5059121714. The cubic root of 1939566161 is about 1247.1007282578.

The spelling of 1939566161 in words is "one billion, nine hundred thirty-nine million, five hundred sixty-six thousand, one hundred sixty-one".