775212131 has 4 divisors (see below), whose sum is σ = 775274664. Its totient is φ = 775149600.

The previous prime is 775212107. The next prime is 775212157. The reversal of 775212131 is 131212577.

775212131 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 131212577 = 53 ⋅2475709.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-775212131 is a prime.

It is a super-2 number, since 2×775212131² = 1201907696099122322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 775212094 and 775212103.

It is not an unprimeable number, because it can be changed into a prime (775212731) 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, 5705 + ... + 39786.

It is an arithmetic number, because the mean of its divisors is an integer number (193818666).

Almost surely, 2^775212131 is an apocalyptic number.

775212131 is a deficient number, since it is larger than the sum of its proper divisors (62533).

775212131 is a wasteful number, since it uses less digits than its factorization.

775212131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62532.

The product of its digits is 2940, while the sum is 29.

The square root of 775212131 is about 27842.6315387034. The cubic root of 775212131 is about 918.6290746425.

The spelling of 775212131 in words is "seven hundred seventy-five million, two hundred twelve thousand, one hundred thirty-one".