261192431828 has 12 divisors (see below), whose sum is σ = 457090610592. Its totient is φ = 130595114520.

The previous prime is 261192431807. The next prime is 261192431921. The reversal of 261192431828 is 828134291162.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 502193 + ... + 880103.

It is an arithmetic number, because the mean of its divisors is an integer number (38090884216).

Almost surely, 2^261192431828 is an apocalyptic number.

It is an amenable number.

261192431828 is a deficient number, since it is larger than the sum of its proper divisors (195898178764).

261192431828 is a wasteful number, since it uses less digits than its factorization.

261192431828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550702 (or 550700 counting only the distinct ones).

The product of its digits is 331776, while the sum is 47.

The spelling of 261192431828 in words is "two hundred sixty-one billion, one hundred ninety-two million, four hundred thirty-one thousand, eight hundred twenty-eight".