11550551 has 2 divisors, whose sum is σ = 11550552. Its totient is φ = 11550550.

The previous prime is 11550541. The next prime is 11550587. The reversal of 11550551 is 15505511.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11550551 - 2²² = 7356247 is a prime.

It is a Sophie Germain 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 (11550541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5775275 + 5775276.

It is an arithmetic number, because the mean of its divisors is an integer number (5775276).

Almost surely, 2^11550551 is an apocalyptic number.

11550551 is a deficient number, since it is larger than the sum of its proper divisors (1).

11550551 is an equidigital number, since it uses as much as digits as its factorization.

11550551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 625, while the sum is 23.

The square root of 11550551 is about 3398.6101571083. The cubic root of 11550551 is about 226.0481206432.

The spelling of 11550551 in words is "eleven million, five hundred fifty thousand, five hundred fifty-one".