331142240509 has 2 divisors, whose sum is σ = 331142240510. Its totient is φ = 331142240508.

The previous prime is 331142240483. The next prime is 331142240531. The reversal of 331142240509 is 905042241133.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 273408723225 + 57733517284 = 522885^2 + 240278^2 .

It is a cyclic number.

It is not a de Polignac number, because 331142240509 - 2⁹ = 331142239997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (331142240909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165571120254 + 165571120255.

It is an arithmetic number, because the mean of its divisors is an integer number (165571120255).

Almost surely, 2^331142240509 is an apocalyptic number.

It is an amenable number.

331142240509 is a deficient number, since it is larger than the sum of its proper divisors (1).

331142240509 is an equidigital number, since it uses as much as digits as its factorization.

331142240509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 34.

The spelling of 331142240509 in words is "three hundred thirty-one billion, one hundred forty-two million, two hundred forty thousand, five hundred nine".