331113509 has 2 divisors, whose sum is σ = 331113510. Its totient is φ = 331113508.

The previous prime is 331113479. The next prime is 331113583. The reversal of 331113509 is 905311133.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 321484900 + 9628609 = 17930^2 + 3103^2 .

It is a cyclic number.

It is not a de Polignac number, because 331113509 - 2¹² = 331109413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (331113599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165556754 + 165556755.

It is an arithmetic number, because the mean of its divisors is an integer number (165556755).

Almost surely, 2^331113509 is an apocalyptic number.

It is an amenable number.

331113509 is a deficient number, since it is larger than the sum of its proper divisors (1).

331113509 is an equidigital number, since it uses as much as digits as its factorization.

331113509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1215, while the sum is 26.

The square root of 331113509 is about 18196.5246407109. The cubic root of 331113509 is about 691.8187048042.

The spelling of 331113509 in words is "three hundred thirty-one million, one hundred thirteen thousand, five hundred nine".