781106781113 has 2 divisors, whose sum is σ = 781106781114. Its totient is φ = 781106781112.

The previous prime is 781106781107. The next prime is 781106781149. The reversal of 781106781113 is 311187601187.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 443466760489 + 337640020624 = 665933^2 + 581068^2 .

It is a cyclic number.

It is not a de Polignac number, because 781106781113 - 2²⁸ = 780838345657 is a prime.

It is a super-2 number, since 2×781106781113² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (781106783113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390553390556 + 390553390557.

It is an arithmetic number, because the mean of its divisors is an integer number (390553390557).

Almost surely, 2^781106781113 is an apocalyptic number.

It is an amenable number.

781106781113 is a deficient number, since it is larger than the sum of its proper divisors (1).

781106781113 is an equidigital number, since it uses as much as digits as its factorization.

781106781113 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56448, while the sum is 44.

The spelling of 781106781113 in words is "seven hundred eighty-one billion, one hundred six million, seven hundred eighty-one thousand, one hundred thirteen".