2191151205 has 12 divisors (see below), whose sum is σ = 3797995500. Its totient is φ = 1168613952.

The previous prime is 2191151203. The next prime is 2191151227. The reversal of 2191151205 is 5021511912.

It can be written as a sum of positive squares in 2 ways, for example, as 322058916 + 1869092289 = 17946^2 + 43233^2 .

It is not a de Polignac number, because 2191151205 - 2¹ = 2191151203 is a prime.

It is a super-2 number, since 2×2191151205² = 9602287206345904050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2191151201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24346080 + ... + 24346169.

It is an arithmetic number, because the mean of its divisors is an integer number (316499625).

Almost surely, 2^2191151205 is an apocalyptic number.

It is an amenable number.

2191151205 is a deficient number, since it is larger than the sum of its proper divisors (1606844295).

2191151205 is a wasteful number, since it uses less digits than its factorization.

2191151205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48692260 (or 48692257 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 27.

The square root of 2191151205 is about 46809.7340838420. The cubic root of 2191151205 is about 1298.8453663001.

The spelling of 2191151205 in words is "two billion, one hundred ninety-one million, one hundred fifty-one thousand, two hundred five".