121541657 has 2 divisors, whose sum is σ = 121541658. Its totient is φ = 121541656.

The previous prime is 121541627. The next prime is 121541659. The reversal of 121541657 is 756145121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85673536 + 35868121 = 9256^2 + 5989^2 .

It is a cyclic number.

It is not a de Polignac number, because 121541657 - 2⁸ = 121541401 is a prime.

Together with 121541659, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (121541659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60770828 + 60770829.

It is an arithmetic number, because the mean of its divisors is an integer number (60770829).

Almost surely, 2^121541657 is an apocalyptic number.

It is an amenable number.

121541657 is a deficient number, since it is larger than the sum of its proper divisors (1).

121541657 is an equidigital number, since it uses as much as digits as its factorization.

121541657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8400, while the sum is 32.

The square root of 121541657 is about 11024.5932804798. The cubic root of 121541657 is about 495.3456851394.

Adding to 121541657 its reverse (756145121), we get a palindrome (877686778).

The spelling of 121541657 in words is "one hundred twenty-one million, five hundred forty-one thousand, six hundred fifty-seven".