491267903971 has 32 divisors (see below), whose sum is σ = 547856691200. Its totient is φ = 437460186240.

The previous prime is 491267903927. The next prime is 491267903989. The reversal of 491267903971 is 179309762194.

It is a cyclic number.

It is not a de Polignac number, because 491267903971 - 2⁷ = 491267903843 is a prime.

It is not an unprimeable number, because it can be changed into a prime (491267903671) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 216511825 + ... + 216514093.

It is an arithmetic number, because the mean of its divisors is an integer number (17120521600).

Almost surely, 2^491267903971 is an apocalyptic number.

491267903971 is a deficient number, since it is larger than the sum of its proper divisors (56588787229).

491267903971 is a wasteful number, since it uses less digits than its factorization.

491267903971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3779.

The product of its (nonzero) digits is 5143824, while the sum is 58.

The spelling of 491267903971 in words is "four hundred ninety-one billion, two hundred sixty-seven million, nine hundred three thousand, nine hundred seventy-one".