491251203789 has 8 divisors (see below), whose sum is σ = 661360844352. Its totient is φ = 324321182880.

The previous prime is 491251203739. The next prime is 491251203799. The reversal of 491251203789 is 987302152194.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 491251203789 - 2¹² = 491251199693 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491251203739) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 794904552 + ... + 794905169.

It is an arithmetic number, because the mean of its divisors is an integer number (82670105544).

Almost surely, 2^491251203789 is an apocalyptic number.

It is an amenable number.

491251203789 is a deficient number, since it is larger than the sum of its proper divisors (170109640563).

491251203789 is a wasteful number, since it uses less digits than its factorization.

491251203789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1589809827.

The product of its (nonzero) digits is 1088640, while the sum is 51.

The spelling of 491251203789 in words is "four hundred ninety-one billion, two hundred fifty-one million, two hundred three thousand, seven hundred eighty-nine".