491749338355001 has 4 divisors (see below), whose sum is σ = 491782888846452. Its totient is φ = 491715787863552.

The previous prime is 491749338354977. The next prime is 491749338355013. The reversal of 491749338355001 is 100553833947194.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 439422213760000 + 52327124595001 = 20962400^2 + 7233749^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-491749338355001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491749338355501) 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, 16775223740 + ... + 16775253053.

It is an arithmetic number, because the mean of its divisors is an integer number (122945722211613).

Almost surely, 2^{491749338355001} is an apocalyptic number.

It is an amenable number.

491749338355001 is a deficient number, since it is larger than the sum of its proper divisors (33550491451).

491749338355001 is a wasteful number, since it uses less digits than its factorization.

491749338355001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33550491450.

The product of its (nonzero) digits is 48988800, while the sum is 62.

The spelling of 491749338355001 in words is "four hundred ninety-one trillion, seven hundred forty-nine billion, three hundred thirty-eight million, three hundred fifty-five thousand, one".