11647381 has 2 divisors, whose sum is σ = 11647382. Its totient is φ = 11647380.

The previous prime is 11647373. The next prime is 11647393. The reversal of 11647381 is 18374611.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10304100 + 1343281 = 3210^2 + 1159^2 .

It is a cyclic number.

It is not a de Polignac number, because 11647381 - 2³ = 11647373 is a prime.

It is a super-2 number, since 2×11647381² = 271322968318322, which contains 22 as substring.

It is equal to p₇₆₆₃₉₀ and since 11647381 and 766390 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11647301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5823690 + 5823691.

It is an arithmetic number, because the mean of its divisors is an integer number (5823691).

Almost surely, 2^11647381 is an apocalyptic number.

It is an amenable number.

11647381 is a deficient number, since it is larger than the sum of its proper divisors (1).

11647381 is an equidigital number, since it uses as much as digits as its factorization.

11647381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032, while the sum is 31.

The square root of 11647381 is about 3412.8259551287. The cubic root of 11647381 is about 226.6780287941.

The spelling of 11647381 in words is "eleven million, six hundred forty-seven thousand, three hundred eighty-one".