31555231100231 has 2 divisors, whose sum is σ = 31555231100232. Its totient is φ = 31555231100230.

The previous prime is 31555231100213. The next prime is 31555231100299. The reversal of 31555231100231 is 13200113255513.

Together with previous prime (31555231100213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31555231100231 - 2²² = 31555226905927 is a prime.

It is a super-2 number, since 2×31555231100231² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31555231100531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15777615550115 + 15777615550116.

It is an arithmetic number, because the mean of its divisors is an integer number (15777615550116).

Almost surely, 2^{31555231100231} is an apocalyptic number.

31555231100231 is a deficient number, since it is larger than the sum of its proper divisors (1).

31555231100231 is an equidigital number, since it uses as much as digits as its factorization.

31555231100231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13500, while the sum is 32.

Adding to 31555231100231 its reverse (13200113255513), we get a palindrome (44755344355744).

The spelling of 31555231100231 in words is "thirty-one trillion, five hundred fifty-five billion, two hundred thirty-one million, one hundred thousand, two hundred thirty-one".