781369097 has 2 divisors, whose sum is σ = 781369098. Its totient is φ = 781369096.

The previous prime is 781369093. The next prime is 781369109. The reversal of 781369097 is 790963187.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 487040761 + 294328336 = 22069^2 + 17156^2 .

It is a cyclic number.

It is not a de Polignac number, because 781369097 - 2² = 781369093 is a prime.

It is a super-2 number, since 2×781369097² = 1221075331493190818, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (781369093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390684548 + 390684549.

It is an arithmetic number, because the mean of its divisors is an integer number (390684549).

Almost surely, 2^781369097 is an apocalyptic number.

It is an amenable number.

781369097 is a deficient number, since it is larger than the sum of its proper divisors (1).

781369097 is an equidigital number, since it uses as much as digits as its factorization.

781369097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 571536, while the sum is 50.

The square root of 781369097 is about 27952.9801094624. The cubic root of 781369097 is about 921.0546730394.

The spelling of 781369097 in words is "seven hundred eighty-one million, three hundred sixty-nine thousand, ninety-seven".