491867136 has 198 divisors, whose sum is σ = 1523745860. Its totient is φ = 152395776.

The previous prime is 491867107. The next prime is 491867143. The reversal of 491867136 is 631768194.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 491867091 and 491867100.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 9280486 + ... + 9280538.

Almost surely, 2^491867136 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 491867136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (761872930).

491867136 is an abundant number, since it is smaller than the sum of its proper divisors (1031878724).

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

491867136 is a wasteful number, since it uses less digits than its factorization.

491867136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151 (or 77 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 491867136 is about 22178.0778247349. The cubic root of 491867136 is about 789.3736080416.

The spelling of 491867136 in words is "four hundred ninety-one million, eight hundred sixty-seven thousand, one hundred thirty-six".