491609836 has 6 divisors (see below), whose sum is σ = 860317220. Its totient is φ = 245804916.

The previous prime is 491609809. The next prime is 491609849. The reversal of 491609836 is 638906194.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61451226 + ... + 61451233.

Almost surely, 2^491609836 is an apocalyptic number.

It is an amenable number.

491609836 is a deficient number, since it is larger than the sum of its proper divisors (368707384).

491609836 is a wasteful number, since it uses less digits than its factorization.

491609836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122902463 (or 122902461 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 46.

The square root of 491609836 is about 22172.2762927039. The cubic root of 491609836 is about 789.2359412882.

It can be divided in two parts, 49160 and 9836, that added together give a triangular number (58996 = T₃₄₃).

The spelling of 491609836 in words is "four hundred ninety-one million, six hundred nine thousand, eight hundred thirty-six".