491101388801 has 4 divisors (see below), whose sum is σ = 491260685232. Its totient is φ = 490942092372.

The previous prime is 491101388797. The next prime is 491101388803. The reversal of 491101388801 is 108883101194.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 491101388801 - 2² = 491101388797 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491101388803) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79643591 + ... + 79649756.

It is an arithmetic number, because the mean of its divisors is an integer number (122815171308).

Almost surely, 2^491101388801 is an apocalyptic number.

It is an amenable number.

491101388801 is a deficient number, since it is larger than the sum of its proper divisors (159296431).

491101388801 is a wasteful number, since it uses less digits than its factorization.

491101388801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159296430.

The product of its (nonzero) digits is 55296, while the sum is 44.

Adding to 491101388801 its reverse (108883101194), we get a palindrome (599984489995).

The spelling of 491101388801 in words is "four hundred ninety-one billion, one hundred one million, three hundred eighty-eight thousand, eight hundred one".