11420551 has 4 divisors (see below), whose sum is σ = 11558232. Its totient is φ = 11282872.

The previous prime is 11420543. The next prime is 11420567. The reversal of 11420551 is 15502411.

11420551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 11420551 - 2³ = 11420543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11420051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68716 + ... + 68881.

It is an arithmetic number, because the mean of its divisors is an integer number (2889558).

Almost surely, 2^11420551 is an apocalyptic number.

11420551 is a deficient number, since it is larger than the sum of its proper divisors (137681).

11420551 is an equidigital number, since it uses as much as digits as its factorization.

11420551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137680.

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 11420551 is about 3379.4305733363. The cubic root of 11420551 is about 225.1968713120.

Adding to 11420551 its reverse (15502411), we get a palindrome (26922962).

The spelling of 11420551 in words is "eleven million, four hundred twenty thousand, five hundred fifty-one".