2231987509 has 2 divisors, whose sum is σ = 2231987510. Its totient is φ = 2231987508.

The previous prime is 2231987503. The next prime is 2231987539. The reversal of 2231987509 is 9057891322.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1701975025 + 530012484 = 41255^2 + 23022^2 .

It is a cyclic number.

It is not a de Polignac number, because 2231987509 - 2³ = 2231987501 is a prime.

It is a super-3 number, since 3×2231987509³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2231987501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1115993754 + 1115993755.

It is an arithmetic number, because the mean of its divisors is an integer number (1115993755).

Almost surely, 2^2231987509 is an apocalyptic number.

It is an amenable number.

2231987509 is a deficient number, since it is larger than the sum of its proper divisors (1).

2231987509 is an equidigital number, since it uses as much as digits as its factorization.

2231987509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 272160, while the sum is 46.

The square root of 2231987509 is about 47243.9150473370. The cubic root of 2231987509 is about 1306.8645775283.

The spelling of 2231987509 in words is "two billion, two hundred thirty-one million, nine hundred eighty-seven thousand, five hundred nine".