1042721776091 has 2 divisors, whose sum is σ = 1042721776092. Its totient is φ = 1042721776090.

The previous prime is 1042721776069. The next prime is 1042721776111. The reversal of 1042721776091 is 1906771272401.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1042721776091 - 2³⁸ = 767843869147 is a prime.

It is not a weakly prime, because it can be changed into another prime (1042721776001) 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, 521360888045 + 521360888046.

It is an arithmetic number, because the mean of its divisors is an integer number (521360888046).

Almost surely, 2^{1042721776091} is an apocalyptic number.

1042721776091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1042721776091 is an equidigital number, since it uses as much as digits as its factorization.

1042721776091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 296352, while the sum is 47.

The spelling of 1042721776091 in words is "one trillion, forty-two billion, seven hundred twenty-one million, seven hundred seventy-six thousand, ninety-one".