491649694 has 16 divisors (see below), whose sum is σ = 746534880. Its totient is φ = 242817120.

The previous prime is 491649667. The next prime is 491649701. The reversal of 491649694 is 496946194.

491649694 = T₁₇₂ + T₁₇₃ + ... + T₁₄₃₄.

It is a super-2 number, since 2×491649694² = 483438843220587272, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83892 + ... + 89560.

It is an arithmetic number, because the mean of its divisors is an integer number (46658430).

Almost surely, 2^491649694 is an apocalyptic number.

491649694 is a deficient number, since it is larger than the sum of its proper divisors (254885186).

491649694 is a wasteful number, since it uses less digits than its factorization.

491649694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6195.

The product of its digits is 1679616, while the sum is 52.

The square root of 491649694 is about 22173.1750996559. The cubic root of 491649694 is about 789.2572702051.

The spelling of 491649694 in words is "four hundred ninety-one million, six hundred forty-nine thousand, six hundred ninety-four".