2131161601 has 4 divisors (see below), whose sum is σ = 2131360704. Its totient is φ = 2130962500.

The previous prime is 2131161589. The next prime is 2131161611. The reversal of 2131161601 is 1061611312.

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 a de Polignac number, because none of the positive numbers 2^k-2131161601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2131161611) 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, 82525 + ... + 105226.

It is an arithmetic number, because the mean of its divisors is an integer number (532840176).

Almost surely, 2^2131161601 is an apocalyptic number.

It is an amenable number.

2131161601 is a deficient number, since it is larger than the sum of its proper divisors (199103).

2131161601 is a wasteful number, since it uses less digits than its factorization.

2131161601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199102.

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 2131161601 is about 46164.5058567727. The cubic root of 2131161601 is about 1286.8822010522.

Adding to 2131161601 its reverse (1061611312), we get a palindrome (3192772913).

The spelling of 2131161601 in words is "two billion, one hundred thirty-one million, one hundred sixty-one thousand, six hundred one".