491217100 has 36 divisors (see below), whose sum is σ = 1162847448. Its totient is φ = 178624000.

The previous prime is 491217071. The next prime is 491217101. The reversal of 491217100 is 1712194.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (491217101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 222181 + ... + 224380.

It is an arithmetic number, because the mean of its divisors is an integer number (32301318).

Almost surely, 2^491217100 is an apocalyptic number.

It is an amenable number.

491217100 is an abundant number, since it is smaller than the sum of its proper divisors (671630348).

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

491217100 is a wasteful number, since it uses less digits than its factorization.

491217100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 446586 (or 446579 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 25.

The square root of 491217100 is about 22163.4180576914. The cubic root of 491217100 is about 789.0257177051.

Adding to 491217100 its reverse (1712194), we get a palindrome (492929294).

The spelling of 491217100 in words is "four hundred ninety-one million, two hundred seventeen thousand, one hundred".