2191051 has 2 divisors, whose sum is σ = 2191052. Its totient is φ = 2191050.

The previous prime is 2191031. The next prime is 2191067. The reversal of 2191051 is 1501912.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2191051 - 2⁵ = 2191019 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (2191001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1095525 + 1095526.

It is an arithmetic number, because the mean of its divisors is an integer number (1095526).

2^2191051 is an apocalyptic number.

2191051 is a deficient number, since it is larger than the sum of its proper divisors (1).

2191051 is an equidigital number, since it uses as much as digits as its factorization.

2191051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90, while the sum is 19.

The square root of 2191051 is about 1480.2199160936. The cubic root of 2191051 is about 129.8825566543.

Adding to 2191051 its reverse (1501912), we get a palindrome (3692963).

The spelling of 2191051 in words is "two million, one hundred ninety-one thousand, fifty-one".