12155641 has 2 divisors, whose sum is σ = 12155642. Its totient is φ = 12155640.

The previous prime is 12155617. The next prime is 12155677. The reversal of 12155641 is 14655121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11971600 + 184041 = 3460^2 + 429^2 .

It is a cyclic number.

It is not a de Polignac number, because 12155641 - 2¹¹ = 12153593 is a prime.

It is not a weakly prime, because it can be changed into another prime (12150641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6077820 + 6077821.

It is an arithmetic number, because the mean of its divisors is an integer number (6077821).

Almost surely, 2^12155641 is an apocalyptic number.

It is an amenable number.

12155641 is a deficient number, since it is larger than the sum of its proper divisors (1).

12155641 is an equidigital number, since it uses as much as digits as its factorization.

12155641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1200, while the sum is 25.

The square root of 12155641 is about 3486.4940843202. The cubic root of 12155641 is about 229.9284024151.

The spelling of 12155641 in words is "twelve million, one hundred fifty-five thousand, six hundred forty-one".