1421551035991 has 2 divisors, whose sum is σ = 1421551035992. Its totient is φ = 1421551035990.

The previous prime is 1421551035973. The next prime is 1421551036013. The reversal of 1421551035991 is 1995301551241.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1421551035991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1421551035391) 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, 710775517995 + 710775517996.

It is an arithmetic number, because the mean of its divisors is an integer number (710775517996).

Almost surely, 2^{1421551035991} is an apocalyptic number.

1421551035991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1421551035991 is an equidigital number, since it uses as much as digits as its factorization.

1421551035991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 243000, while the sum is 46.

The spelling of 1421551035991 in words is "one trillion, four hundred twenty-one billion, five hundred fifty-one million, thirty-five thousand, nine hundred ninety-one".