491293425081 has 8 divisors (see below), whose sum is σ = 677646103680. Its totient is φ = 316234848272.

The previous prime is 491293425079. The next prime is 491293425083. The reversal of 491293425081 is 180524392194.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (491293425079) and next prime (491293425083).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 491293425081 - 2¹ = 491293425079 is a prime.

It is a super-2 number, since 2×491293425081² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 491293425081.

It is not an unprimeable number, because it can be changed into a prime (491293425083) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2823525345 + ... + 2823525518.

It is an arithmetic number, because the mean of its divisors is an integer number (84705762960).

Almost surely, 2^491293425081 is an apocalyptic number.

It is an amenable number.

491293425081 is a deficient number, since it is larger than the sum of its proper divisors (186352678599).

491293425081 is a wasteful number, since it uses less digits than its factorization.

491293425081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5647050895.

The product of its (nonzero) digits is 622080, while the sum is 48.

The spelling of 491293425081 in words is "four hundred ninety-one billion, two hundred ninety-three million, four hundred twenty-five thousand, eighty-one".