781219797947 has 2 divisors, whose sum is σ = 781219797948. Its totient is φ = 781219797946.

The previous prime is 781219797901. The next prime is 781219797959. The reversal of 781219797947 is 749797912187.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-781219797947 is a prime.

It is a super-2 number, since 2×781219797947² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (781219797047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390609898973 + 390609898974.

It is an arithmetic number, because the mean of its divisors is an integer number (390609898974).

Almost surely, 2^781219797947 is an apocalyptic number.

781219797947 is a deficient number, since it is larger than the sum of its proper divisors (1).

781219797947 is an equidigital number, since it uses as much as digits as its factorization.

781219797947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 112021056, while the sum is 71.

The spelling of 781219797947 in words is "seven hundred eighty-one billion, two hundred nineteen million, seven hundred ninety-seven thousand, nine hundred forty-seven".