775139047 has 4 divisors (see below), whose sum is σ = 775340856. Its totient is φ = 774937240.

The previous prime is 775139023. The next prime is 775139063. The reversal of 775139047 is 740931577.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 740931577 = 139 ⋅5330443.

It is a cyclic number.

It is not a de Polignac number, because 775139047 - 2¹⁹ = 774614759 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 775138994 and 775139012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (775139747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95029 + ... + 102862.

It is an arithmetic number, because the mean of its divisors is an integer number (193835214).

Almost surely, 2^775139047 is an apocalyptic number.

775139047 is a deficient number, since it is larger than the sum of its proper divisors (201809).

775139047 is a wasteful number, since it uses less digits than its factorization.

775139047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201808.

The product of its (nonzero) digits is 185220, while the sum is 43.

The square root of 775139047 is about 27841.3190599871. The cubic root of 775139047 is about 918.6002054704.

The spelling of 775139047 in words is "seven hundred seventy-five million, one hundred thirty-nine thousand, forty-seven".