2491640226 has 12 divisors (see below), whose sum is σ = 5398553862. Its totient is φ = 830546736.

The previous prime is 2491640219. The next prime is 2491640231. The reversal of 2491640226 is 6220461942.

2491640226 is a `hidden beast` number, since 2 + 4 + 9 + 1 + 640 + 2 + 2 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1284147225 + 1207493001 = 35835^2 + 34749^2 .

It is a super-3 number, since 3×2491640226³ (a number of 29 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 69212211 + ... + 69212246.

Almost surely, 2^2491640226 is an apocalyptic number.

2491640226 is an abundant number, since it is smaller than the sum of its proper divisors (2906913636).

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

2491640226 is a wasteful number, since it uses less digits than its factorization.

2491640226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138424465 (or 138424462 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 2491640226 is about 49916.3322570880. The cubic root of 2491640226 is about 1355.6943244208.

The spelling of 2491640226 in words is "two billion, four hundred ninety-one million, six hundred forty thousand, two hundred twenty-six".