331142240531 has 2 divisors, whose sum is σ = 331142240532. Its totient is φ = 331142240530.

The previous prime is 331142240509. The next prime is 331142240551. The reversal of 331142240531 is 135042241133.

It is a strong prime.

It is an emirp because it is prime and its reverse (135042241133) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-331142240531 is a prime.

It is a super-2 number, since 2×331142240531² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 331142240494 and 331142240503.

It is not a weakly prime, because it can be changed into another prime (331142240551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165571120265 + 165571120266.

It is an arithmetic number, because the mean of its divisors is an integer number (165571120266).

Almost surely, 2^331142240531 is an apocalyptic number.

331142240531 is a deficient number, since it is larger than the sum of its proper divisors (1).

331142240531 is an equidigital number, since it uses as much as digits as its factorization.

331142240531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 29.

Adding to 331142240531 its reverse (135042241133), we get a palindrome (466184481664).

The spelling of 331142240531 in words is "three hundred thirty-one billion, one hundred forty-two million, two hundred forty thousand, five hundred thirty-one".