781054431279 has 4 divisors (see below), whose sum is σ = 1041405908376. Its totient is φ = 520702954184.

The previous prime is 781054431271. The next prime is 781054431281. The reversal of 781054431279 is 972134450187.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 781054431279 - 2³ = 781054431271 is a prime.

It is a super-2 number, since 2×781054431279² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (781054431271) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130175738544 + ... + 130175738549.

It is an arithmetic number, because the mean of its divisors is an integer number (260351477094).

Almost surely, 2^781054431279 is an apocalyptic number.

781054431279 is a deficient number, since it is larger than the sum of its proper divisors (260351477097).

781054431279 is a wasteful number, since it uses less digits than its factorization.

781054431279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260351477096.

The product of its (nonzero) digits is 1693440, while the sum is 51.

The spelling of 781054431279 in words is "seven hundred eighty-one billion, fifty-four million, four hundred thirty-one thousand, two hundred seventy-nine".