31330221001091 has 2 divisors, whose sum is σ = 31330221001092. Its totient is φ = 31330221001090.

The previous prime is 31330221001087. The next prime is 31330221001103. The reversal of 31330221001091 is 19010012203313.

It is a weak prime.

It is an emirp because it is prime and its reverse (19010012203313) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31330221001091 - 2² = 31330221001087 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31330221001091.

It is not a weakly prime, because it can be changed into another prime (31330221001291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15665110500545 + 15665110500546.

It is an arithmetic number, because the mean of its divisors is an integer number (15665110500546).

Almost surely, 2^{31330221001091} is an apocalyptic number.

31330221001091 is a deficient number, since it is larger than the sum of its proper divisors (1).

31330221001091 is an equidigital number, since it uses as much as digits as its factorization.

31330221001091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 26.

The spelling of 31330221001091 in words is "thirty-one trillion, three hundred thirty billion, two hundred twenty-one million, one thousand, ninety-one".