2231387209 has 2 divisors, whose sum is σ = 2231387210. Its totient is φ = 2231387208.

The previous prime is 2231387129. The next prime is 2231387233. The reversal of 2231387209 is 9027831322.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1166017609 + 1065369600 = 34147^2 + 32640^2 .

It is a cyclic number.

It is not a de Polignac number, because 2231387209 - 2²³ = 2222998601 is a prime.

It is a super-3 number, since 3×2231387209³ (a number of 29 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (2231387299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1115693604 + 1115693605.

It is an arithmetic number, because the mean of its divisors is an integer number (1115693605).

Almost surely, 2^2231387209 is an apocalyptic number.

It is an amenable number.

2231387209 is a deficient number, since it is larger than the sum of its proper divisors (1).

2231387209 is an equidigital number, since it uses as much as digits as its factorization.

2231387209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 2231387209 is about 47237.5614209709. The cubic root of 2231387209 is about 1306.7474052554.

The spelling of 2231387209 in words is "two billion, two hundred thirty-one million, three hundred eighty-seven thousand, two hundred nine".