11615551 has 2 divisors, whose sum is σ = 11615552. Its totient is φ = 11615550.

The previous prime is 11615531. The next prime is 11615557. The reversal of 11615551 is 15551611.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11615551 - 2⁵ = 11615519 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11615557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5807775 + 5807776.

It is an arithmetic number, because the mean of its divisors is an integer number (5807776).

Almost surely, 2^11615551 is an apocalyptic number.

11615551 is a deficient number, since it is larger than the sum of its proper divisors (1).

11615551 is an equidigital number, since it uses as much as digits as its factorization.

11615551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 750, while the sum is 25.

The square root of 11615551 is about 3408.1594739683. The cubic root of 11615551 is about 226.4713515966.

The spelling of 11615551 in words is "eleven million, six hundred fifteen thousand, five hundred fifty-one".