2172959813 has 2 divisors, whose sum is σ = 2172959814. Its totient is φ = 2172959812.

The previous prime is 2172959809. The next prime is 2172959851. The reversal of 2172959813 is 3189592712.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1765848484 + 407111329 = 42022^2 + 20177^2 .

It is a cyclic number.

It is not a de Polignac number, because 2172959813 - 2² = 2172959809 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2172959863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1086479906 + 1086479907.

It is an arithmetic number, because the mean of its divisors is an integer number (1086479907).

Almost surely, 2^2172959813 is an apocalyptic number.

It is an amenable number.

2172959813 is a deficient number, since it is larger than the sum of its proper divisors (1).

2172959813 is an equidigital number, since it uses as much as digits as its factorization.

2172959813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 272160, while the sum is 47.

The square root of 2172959813 is about 46615.0170331407. The cubic root of 2172959813 is about 1295.2409450156.

The spelling of 2172959813 in words is "two billion, one hundred seventy-two million, nine hundred fifty-nine thousand, eight hundred thirteen".