491125089 has 48 divisors (see below), whose sum is σ = 824608512. Its totient is φ = 257709312.

The previous prime is 491125069. The next prime is 491125099. The reversal of 491125089 is 980521194.

It is not a de Polignac number, because 491125089 - 2⁵ = 491125057 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (491125039) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 444712 + ... + 445814.

It is an arithmetic number, because the mean of its divisors is an integer number (17179344).

Almost surely, 2^491125089 is an apocalyptic number.

491125089 is a gapful number since it is divisible by the number (49) formed by its first and last digit.

It is an amenable number.

491125089 is a deficient number, since it is larger than the sum of its proper divisors (333483423).

491125089 is a wasteful number, since it uses less digits than its factorization.

491125089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1366 (or 1359 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 39.

The square root of 491125089 is about 22161.3422201815. The cubic root of 491125089 is about 788.9764498907.

The spelling of 491125089 in words is "four hundred ninety-one million, one hundred twenty-five thousand, eighty-nine".