11661547 has 2 divisors, whose sum is σ = 11661548. Its totient is φ = 11661546.

The previous prime is 11661523. The next prime is 11661563. The reversal of 11661547 is 74516611.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11661547 - 2¹¹ = 11659499 is a prime.

It is equal to p₇₆₇₂₉₀ and since 11661547 and 767290 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (11661347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5830773 + 5830774.

It is an arithmetic number, because the mean of its divisors is an integer number (5830774).

Almost surely, 2^11661547 is an apocalyptic number.

11661547 is a deficient number, since it is larger than the sum of its proper divisors (1).

11661547 is an equidigital number, since it uses as much as digits as its factorization.

11661547 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5040, while the sum is 31.

The square root of 11661547 is about 3414.9007306216. The cubic root of 11661547 is about 226.7698897886.

The spelling of 11661547 in words is "eleven million, six hundred sixty-one thousand, five hundred forty-seven".