11655551 has 2 divisors, whose sum is σ = 11655552. Its totient is φ = 11655550.

The previous prime is 11655547. The next prime is 11655563. The reversal of 11655551 is 15555611.

It is a happy number.

11655551 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11655551 - 2² = 11655547 is a prime.

It is a super-2 number, since 2×11655551² = 271703738227202, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11655751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5827775 + 5827776.

It is an arithmetic number, because the mean of its divisors is an integer number (5827776).

Almost surely, 2^11655551 is an apocalyptic number.

11655551 is a deficient number, since it is larger than the sum of its proper divisors (1).

11655551 is an equidigital number, since it uses as much as digits as its factorization.

11655551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3750, while the sum is 29.

The square root of 11655551 is about 3414.0227005689. The cubic root of 11655551 is about 226.7310171483.

The spelling of 11655551 in words is "eleven million, six hundred fifty-five thousand, five hundred fifty-one".