11271551 has 4 divisors (see below), whose sum is σ = 11282712. Its totient is φ = 11260392.

The previous prime is 11271529. The next prime is 11271571. The reversal of 11271551 is 15517211.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11271551 - 2¹⁸ = 11009407 is a prime.

It is a Duffinian number.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11271521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3896 + ... + 6141.

It is an arithmetic number, because the mean of its divisors is an integer number (2820678).

Almost surely, 2^11271551 is an apocalyptic number.

11271551 is a deficient number, since it is larger than the sum of its proper divisors (11161).

11271551 is a wasteful number, since it uses less digits than its factorization.

11271551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11160.

The product of its digits is 350, while the sum is 23.

The square root of 11271551 is about 3357.3130625546. The cubic root of 11271551 is about 224.2132256968.

Adding to 11271551 its reverse (15517211), we get a palindrome (26788762).

The spelling of 11271551 in words is "eleven million, two hundred seventy-one thousand, five hundred fifty-one".