491163637 has 8 divisors (see below), whose sum is σ = 502733504. Its totient is φ = 479724768.

The previous prime is 491163611. The next prime is 491163697. The reversal of 491163637 is 736361194.

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 491163637 - 2¹¹ = 491161589 is a prime.

It is a super-2 number, since 2×491163637² = 482483436622135538, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 491163637.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491163697) 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, 25143 + ... + 40180.

It is an arithmetic number, because the mean of its divisors is an integer number (62841688).

Almost surely, 2^491163637 is an apocalyptic number.

It is an amenable number.

491163637 is a deficient number, since it is larger than the sum of its proper divisors (11569867).

491163637 is a wasteful number, since it uses less digits than its factorization.

491163637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65499.

The product of its digits is 81648, while the sum is 40.

The square root of 491163637 is about 22162.2119157813. The cubic root of 491163637 is about 788.9970913859.

The spelling of 491163637 in words is "four hundred ninety-one million, one hundred sixty-three thousand, six hundred thirty-seven".