2173812881 has 2 divisors, whose sum is σ = 2173812882. Its totient is φ = 2173812880.

The previous prime is 2173812811. The next prime is 2173812887. The reversal of 2173812881 is 1882183712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1943046400 + 230766481 = 44080^2 + 15191^2 .

It is a cyclic number.

It is not a de Polignac number, because 2173812881 - 2¹⁴ = 2173796497 is a prime.

It is a super-2 number, since 2×2173812881² = 9450924883203040322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2173812887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1086906440 + 1086906441.

It is an arithmetic number, because the mean of its divisors is an integer number (1086906441).

Almost surely, 2^2173812881 is an apocalyptic number.

It is an amenable number.

2173812881 is a deficient number, since it is larger than the sum of its proper divisors (1).

2173812881 is an equidigital number, since it uses as much as digits as its factorization.

2173812881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43008, while the sum is 41.

The square root of 2173812881 is about 46624.1662767282. The cubic root of 2173812881 is about 1295.4104195475.

The spelling of 2173812881 in words is "two billion, one hundred seventy-three million, eight hundred twelve thousand, eight hundred eighty-one".