2187331273 has 2 divisors, whose sum is σ = 2187331274. Its totient is φ = 2187331272.

The previous prime is 2187331271. The next prime is 2187331277. The reversal of 2187331273 is 3721337812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2040509584 + 146821689 = 45172^2 + 12117^2 .

It is a cyclic number.

It is not a de Polignac number, because 2187331273 - 2¹ = 2187331271 is a prime.

Together with 2187331271, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2187331271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1093665636 + 1093665637.

It is an arithmetic number, because the mean of its divisors is an integer number (1093665637).

Almost surely, 2^2187331273 is an apocalyptic number.

It is an amenable number.

2187331273 is a deficient number, since it is larger than the sum of its proper divisors (1).

2187331273 is an equidigital number, since it uses as much as digits as its factorization.

2187331273 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42336, while the sum is 37.

The square root of 2187331273 is about 46768.9135323882. The cubic root of 2187331273 is about 1298.0901488350.

The spelling of 2187331273 in words is "two billion, one hundred eighty-seven million, three hundred thirty-one thousand, two hundred seventy-three".