781247451013 has 2 divisors, whose sum is σ = 781247451014. Its totient is φ = 781247451012.

The previous prime is 781247451007. The next prime is 781247451037. The reversal of 781247451013 is 310154742187.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 525598900324 + 255648550689 = 724982^2 + 505617^2 .

It is an emirp because it is prime and its reverse (310154742187) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 781247451013 - 2¹³ = 781247442821 is a prime.

It is a super-2 number, since 2×781247451013² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (781247451713) 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, 390623725506 + 390623725507.

It is an arithmetic number, because the mean of its divisors is an integer number (390623725507).

Almost surely, 2^781247451013 is an apocalyptic number.

It is an amenable number.

781247451013 is a deficient number, since it is larger than the sum of its proper divisors (1).

781247451013 is an equidigital number, since it uses as much as digits as its factorization.

781247451013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 188160, while the sum is 43.

The spelling of 781247451013 in words is "seven hundred eighty-one billion, two hundred forty-seven million, four hundred fifty-one thousand, thirteen".