491808986394 has 32 divisors (see below), whose sum is σ = 1075961650176. Its totient is φ = 148626934320.

The previous prime is 491808986387. The next prime is 491808986401. The reversal of 491808986394 is 493689808194.

It is an interprime number because it is at equal distance from previous prime (491808986387) and next prime (491808986401).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10127892 + ... + 10176335.

It is an arithmetic number, because the mean of its divisors is an integer number (33623801568).

Almost surely, 2^491808986394 is an apocalyptic number.

491808986394 is an abundant number, since it is smaller than the sum of its proper divisors (584152663782).

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

491808986394 is a wasteful number, since it uses less digits than its factorization.

491808986394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20304610.

The product of its (nonzero) digits is 107495424, while the sum is 69.

The spelling of 491808986394 in words is "four hundred ninety-one billion, eight hundred eight million, nine hundred eighty-six thousand, three hundred ninety-four".