11195551 has 2 divisors, whose sum is σ = 11195552. Its totient is φ = 11195550.

The previous prime is 11195543. The next prime is 11195563. The reversal of 11195551 is 15559111.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11195551 - 2³ = 11195543 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11195521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5597775 + 5597776.

It is an arithmetic number, because the mean of its divisors is an integer number (5597776).

Almost surely, 2^11195551 is an apocalyptic number.

11195551 is a deficient number, since it is larger than the sum of its proper divisors (1).

11195551 is an equidigital number, since it uses as much as digits as its factorization.

11195551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1125, while the sum is 28.

The square root of 11195551 is about 3345.9753436031. The cubic root of 11195551 is about 223.7081592123.

It can be divided in two parts, 1119 and 5551, that added together give a triangular number (6670 = T₁₁₅).

The spelling of 11195551 in words is "eleven million, one hundred ninety-five thousand, five hundred fifty-one".