781495697 has 2 divisors, whose sum is σ = 781495698. Its totient is φ = 781495696.

The previous prime is 781495639. The next prime is 781495699. The reversal of 781495697 is 796594187.

781495697 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 746874241 + 34621456 = 27329^2 + 5884^2 .

It is a cyclic number.

It is not a de Polignac number, because 781495697 - 2¹⁰ = 781494673 is a prime.

It is a super-2 number, since 2×781495697² = 1221471048859031618, which contains 22 as substring.

Together with 781495699, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (781495699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390747848 + 390747849.

It is an arithmetic number, because the mean of its divisors is an integer number (390747849).

Almost surely, 2^781495697 is an apocalyptic number.

It is an amenable number.

781495697 is a deficient number, since it is larger than the sum of its proper divisors (1).

781495697 is an equidigital number, since it uses as much as digits as its factorization.

781495697 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3810240, while the sum is 56.

The square root of 781495697 is about 27955.2445347917. The cubic root of 781495697 is about 921.1044144591.

The spelling of 781495697 in words is "seven hundred eighty-one million, four hundred ninety-five thousand, six hundred ninety-seven".