11981357 has 2 divisors, whose sum is σ = 11981358. Its totient is φ = 11981356.

The previous prime is 11981353. The next prime is 11981363. The reversal of 11981357 is 75318911.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6832996 + 5148361 = 2614^2 + 2269^2 .

It is an emirp because it is prime and its reverse (75318911) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11981357 - 2² = 11981353 is a prime.

It is a super-2 number, since 2×11981357² = 287105831122898, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11981353) 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, 5990678 + 5990679.

It is an arithmetic number, because the mean of its divisors is an integer number (5990679).

Almost surely, 2^11981357 is an apocalyptic number.

It is an amenable number.

11981357 is a deficient number, since it is larger than the sum of its proper divisors (1).

11981357 is an equidigital number, since it uses as much as digits as its factorization.

11981357 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7560, while the sum is 35.

The square root of 11981357 is about 3461.4096839294. The cubic root of 11981357 is about 228.8242264618.

The spelling of 11981357 in words is "eleven million, nine hundred eighty-one thousand, three hundred fifty-seven".