491709693925 has 24 divisors (see below), whose sum is σ = 641972656160. Its totient is φ = 372570062400.

The previous prime is 491709693859. The next prime is 491709693947. The reversal of 491709693925 is 529396907194.

It is a happy number.

It is not a de Polignac number, because 491709693925 - 2²¹ = 491707596773 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1781254 + ... + 2038696.

Almost surely, 2^491709693925 is an apocalyptic number.

It is an amenable number.

491709693925 is a deficient number, since it is larger than the sum of its proper divisors (150262962235).

491709693925 is a wasteful number, since it uses less digits than its factorization.

491709693925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261493 (or 261488 counting only the distinct ones).

The product of its (nonzero) digits is 33067440, while the sum is 64.

The spelling of 491709693925 in words is "four hundred ninety-one billion, seven hundred nine million, six hundred ninety-three thousand, nine hundred twenty-five".