781272085229 has 2 divisors, whose sum is σ = 781272085230. Its totient is φ = 781272085228.

The previous prime is 781272085207. The next prime is 781272085249. The reversal of 781272085229 is 922580272187.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 525767109604 + 255504975625 = 725098^2 + 505475^2 .

It is a cyclic number.

It is not a de Polignac number, because 781272085229 - 2²⁰ = 781271036653 is a prime.

It is a super-2 number, since 2×781272085229² (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 (781272085249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390636042614 + 390636042615.

It is an arithmetic number, because the mean of its divisors is an integer number (390636042615).

Almost surely, 2^781272085229 is an apocalyptic number.

It is an amenable number.

781272085229 is a deficient number, since it is larger than the sum of its proper divisors (1).

781272085229 is an equidigital number, since it uses as much as digits as its factorization.

781272085229 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2257920, while the sum is 53.

The spelling of 781272085229 in words is "seven hundred eighty-one billion, two hundred seventy-two million, eighty-five thousand, two hundred twenty-nine".