111331221001291 has 2 divisors, whose sum is σ = 111331221001292. Its totient is φ = 111331221001290.

The previous prime is 111331221001279. The next prime is 111331221001307. The reversal of 111331221001291 is 192100122133111.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111331221001291 is a prime.

It is not a weakly prime, because it can be changed into another prime (111331221001211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55665610500645 + 55665610500646.

It is an arithmetic number, because the mean of its divisors is an integer number (55665610500646).

Almost surely, 2^{111331221001291} is an apocalyptic number.

111331221001291 is a deficient number, since it is larger than the sum of its proper divisors (1).

111331221001291 is an equidigital number, since it uses as much as digits as its factorization.

111331221001291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 28.

The spelling of 111331221001291 in words is "one hundred eleven trillion, three hundred thirty-one billion, two hundred twenty-one million, one thousand, two hundred ninety-one".