31232221087 has 2 divisors, whose sum is σ = 31232221088. Its totient is φ = 31232221086.

The previous prime is 31232221039. The next prime is 31232221103. The reversal of 31232221087 is 78012223213.

It is a strong prime.

It is an emirp because it is prime and its reverse (78012223213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31232221087 - 2²⁷ = 31098003359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31232221487) 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, 15616110543 + 15616110544.

It is an arithmetic number, because the mean of its divisors is an integer number (15616110544).

Almost surely, 2^31232221087 is an apocalyptic number.

31232221087 is a deficient number, since it is larger than the sum of its proper divisors (1).

31232221087 is an equidigital number, since it uses as much as digits as its factorization.

31232221087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 31.

The spelling of 31232221087 in words is "thirty-one billion, two hundred thirty-two million, two hundred twenty-one thousand, eighty-seven".