2191001355 has 24 divisors (see below), whose sum is σ = 3859998480. Its totient is φ = 1149376320.

The previous prime is 2191001347. The next prime is 2191001363. The reversal of 2191001355 is 5531001912.

It is an interprime number because it is at equal distance from previous prime (2191001347) and next prime (2191001363).

It is not a de Polignac number, because 2191001355 - 2³ = 2191001347 is a prime.

It is a super-2 number, since 2×2191001355² = 9600973875223672050, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 396345 + ... + 401834.

It is an arithmetic number, because the mean of its divisors is an integer number (160833270).

Almost surely, 2^2191001355 is an apocalyptic number.

2191001355 is a deficient number, since it is larger than the sum of its proper divisors (1668997125).

2191001355 is a wasteful number, since it uses less digits than its factorization.

2191001355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 798251 (or 798248 counting only the distinct ones).

The product of its (nonzero) digits is 1350, while the sum is 27.

The square root of 2191001355 is about 46808.1334278563. The cubic root of 2191001355 is about 1298.8157568396.

The spelling of 2191001355 in words is "two billion, one hundred ninety-one million, one thousand, three hundred fifty-five".