2131722465 has 16 divisors (see below), whose sum is σ = 3419670528. Its totient is φ = 1133947136.

The previous prime is 2131722413. The next prime is 2131722493. The reversal of 2131722465 is 5642271312.

It is a cyclic number.

It is not a de Polignac number, because 2131722465 - 2⁷ = 2131722337 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 179784 + ... + 191273.

It is an arithmetic number, because the mean of its divisors is an integer number (213729408).

Almost surely, 2^2131722465 is an apocalyptic number.

It is an amenable number.

2131722465 is a deficient number, since it is larger than the sum of its proper divisors (1287948063).

2131722465 is a wasteful number, since it uses less digits than its factorization.

2131722465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371448.

The product of its digits is 20160, while the sum is 33.

The square root of 2131722465 is about 46170.5800808264. The cubic root of 2131722465 is about 1286.9950819949.

Adding to 2131722465 its reverse (5642271312), we get a palindrome (7773993777).

The spelling of 2131722465 in words is "two billion, one hundred thirty-one million, seven hundred twenty-two thousand, four hundred sixty-five".