121605137 has 2 divisors, whose sum is σ = 121605138. Its totient is φ = 121605136.

The previous prime is 121605103. The next prime is 121605193. The reversal of 121605137 is 731506121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 101525776 + 20079361 = 10076^2 + 4481^2 .

It is a cyclic number.

It is not a de Polignac number, because 121605137 - 2⁸ = 121604881 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (121605637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60802568 + 60802569.

It is an arithmetic number, because the mean of its divisors is an integer number (60802569).

Almost surely, 2^121605137 is an apocalyptic number.

It is an amenable number.

121605137 is a deficient number, since it is larger than the sum of its proper divisors (1).

121605137 is an equidigital number, since it uses as much as digits as its factorization.

121605137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 121605137 is about 11027.4719224308. The cubic root of 121605137 is about 495.4319081734.

The spelling of 121605137 in words is "one hundred twenty-one million, six hundred five thousand, one hundred thirty-seven".