2191287026 has 8 divisors (see below), whose sum is σ = 3317649840. Its totient is φ = 1085403748.

The previous prime is 2191287023. The next prime is 2191287041. The reversal of 2191287026 is 6207821912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×2191287026³ (a number of 29 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (2191287023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5119616 + ... + 5120043.

It is an arithmetic number, because the mean of its divisors is an integer number (414706230).

Almost surely, 2^2191287026 is an apocalyptic number.

2191287026 is a deficient number, since it is larger than the sum of its proper divisors (1126362814).

2191287026 is a wasteful number, since it uses less digits than its factorization.

2191287026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10239768.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 2191287026 is about 46811.1848386686. The cubic root of 2191287026 is about 1298.8722025481.

The spelling of 2191287026 in words is "two billion, one hundred ninety-one million, two hundred eighty-seven thousand, twenty-six".