12155617 has 2 divisors, whose sum is σ = 12155618. Its totient is φ = 12155616.

The previous prime is 12155587. The next prime is 12155641. The reversal of 12155617 is 71655121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7485696 + 4669921 = 2736^2 + 2161^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12155617 is a prime.

It is not a weakly prime, because it can be changed into another prime (12155677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6077808 + 6077809.

It is an arithmetic number, because the mean of its divisors is an integer number (6077809).

Almost surely, 2^12155617 is an apocalyptic number.

It is an amenable number.

12155617 is a deficient number, since it is larger than the sum of its proper divisors (1).

12155617 is an equidigital number, since it uses as much as digits as its factorization.

12155617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2100, while the sum is 28.

The square root of 12155617 is about 3486.4906424656. The cubic root of 12155617 is about 229.9282510921.

The spelling of 12155617 in words is "twelve million, one hundred fifty-five thousand, six hundred seventeen".