2191057826 has 4 divisors (see below), whose sum is σ = 3286586742. Its totient is φ = 1095528912.

The previous prime is 2191057787. The next prime is 2191057849. The reversal of 2191057826 is 6287501912.

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

It can be written as a sum of positive squares in only one way, i.e., 1747323601 + 443734225 = 41801^2 + 21065^2 .

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 as a sum of consecutive naturals, namely, 547764455 + ... + 547764458.

Almost surely, 2^2191057826 is an apocalyptic number.

2191057826 is a deficient number, since it is larger than the sum of its proper divisors (1095528916).

2191057826 is a wasteful number, since it uses less digits than its factorization.

2191057826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1095528915.

The product of its (nonzero) digits is 60480, while the sum is 41.

The square root of 2191057826 is about 46808.7366417852. The cubic root of 2191057826 is about 1298.8269153287.

The spelling of 2191057826 in words is "two billion, one hundred ninety-one million, fifty-seven thousand, eight hundred twenty-six".