491918921430 has 32 divisors (see below), whose sum is σ = 1180634918400. Its totient is φ = 131175100512.

The previous prime is 491918921401. The next prime is 491918921467. The reversal of 491918921430 is 34129819194.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1165731 + ... + 1530609.

It is an arithmetic number, because the mean of its divisors is an integer number (36894841200).

Almost surely, 2^491918921430 is an apocalyptic number.

491918921430 is an abundant number, since it is smaller than the sum of its proper divisors (688715996970).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

491918921430 is a wasteful number, since it uses less digits than its factorization.

491918921430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409828.

The product of its (nonzero) digits is 559872, while the sum is 51.

The spelling of 491918921430 in words is "four hundred ninety-one billion, nine hundred eighteen million, nine hundred twenty-one thousand, four hundred thirty".