491289012 has 36 divisors (see below), whose sum is σ = 1265305860. Its totient is φ = 160672512.

The previous prime is 491288999. The next prime is 491289079. The reversal of 491289012 is 210982194.

It can be written as a sum of positive squares in 2 ways, for example, as 193933476 + 297355536 = 13926^2 + 17244^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×491289012² = 482729786623872288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 126837 + ... + 130652.

It is an arithmetic number, because the mean of its divisors is an integer number (35147385).

Almost surely, 2^491289012 is an apocalyptic number.

It is an amenable number.

491289012 is an abundant number, since it is smaller than the sum of its proper divisors (774016848).

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

491289012 is a wasteful number, since it uses less digits than its factorization.

491289012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257552 (or 257547 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 491289012 is about 22165.0403112649. The cubic root of 491289012 is about 789.0642191123.

The spelling of 491289012 in words is "four hundred ninety-one million, two hundred eighty-nine thousand, twelve".