489951091 has 4 divisors (see below), whose sum is σ = 559944112. Its totient is φ = 419958072.

The previous prime is 489951089. The next prime is 489951097. The reversal of 489951091 is 190159984.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 489951091 - 2¹ = 489951089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (489951097) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34996500 + ... + 34996513.

It is an arithmetic number, because the mean of its divisors is an integer number (139986028).

Almost surely, 2^489951091 is an apocalyptic number.

489951091 is a deficient number, since it is larger than the sum of its proper divisors (69993021).

489951091 is an equidigital number, since it uses as much as digits as its factorization.

489951091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69993020.

The product of its (nonzero) digits is 116640, while the sum is 46.

The square root of 489951091 is about 22134.8388519094. The cubic root of 489951091 is about 788.3472851246.

It can be divided in two parts, 48995 and 1091, that added together give a triangular number (50086 = T₃₁₆).

The spelling of 489951091 in words is "four hundred eighty-nine million, nine hundred fifty-one thousand, ninety-one".