1491019859977 has 2 divisors, whose sum is σ = 1491019859978. Its totient is φ = 1491019859976.

The previous prime is 1491019859899. The next prime is 1491019859983. The reversal of 1491019859977 is 7799589101941.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 809245975561 + 681773884416 = 899581^2 + 825696^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1491019859977 is a prime.

It is not a weakly prime, because it can be changed into another prime (1491019851977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 745509929988 + 745509929989.

It is an arithmetic number, because the mean of its divisors is an integer number (745509929989).

Almost surely, 2^{1491019859977} is an apocalyptic number.

It is an amenable number.

1491019859977 is a deficient number, since it is larger than the sum of its proper divisors (1).

1491019859977 is an equidigital number, since it uses as much as digits as its factorization.

1491019859977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51438240, while the sum is 70.

The spelling of 1491019859977 in words is "one trillion, four hundred ninety-one billion, nineteen million, eight hundred fifty-nine thousand, nine hundred seventy-seven".