133431311231 has 2 divisors, whose sum is σ = 133431311232. Its totient is φ = 133431311230.

The previous prime is 133431311183. The next prime is 133431311263. The reversal of 133431311231 is 132113134331.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133431311231 is a prime.

It is a super-2 number, since 2×133431311231² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 133431311231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133431311281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66715655615 + 66715655616.

It is an arithmetic number, because the mean of its divisors is an integer number (66715655616).

Almost surely, 2^133431311231 is an apocalyptic number.

133431311231 is a deficient number, since it is larger than the sum of its proper divisors (1).

133431311231 is an equidigital number, since it uses as much as digits as its factorization.

133431311231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1944, while the sum is 26.

Adding to 133431311231 its reverse (132113134331), we get a palindrome (265544445562).

The spelling of 133431311231 in words is "one hundred thirty-three billion, four hundred thirty-one million, three hundred eleven thousand, two hundred thirty-one".