121243657 has 2 divisors, whose sum is σ = 121243658. Its totient is φ = 121243656.

The previous prime is 121243627. The next prime is 121243663. The reversal of 121243657 is 756342121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64256256 + 56987401 = 8016^2 + 7549^2 .

It is a cyclic number.

It is not a de Polignac number, because 121243657 - 2¹⁵ = 121210889 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (121243627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60621828 + 60621829.

It is an arithmetic number, because the mean of its divisors is an integer number (60621829).

Almost surely, 2^121243657 is an apocalyptic number.

It is an amenable number.

121243657 is a deficient number, since it is larger than the sum of its proper divisors (1).

121243657 is an equidigital number, since it uses as much as digits as its factorization.

121243657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10080, while the sum is 31.

The square root of 121243657 is about 11011.0697482125. The cubic root of 121243657 is about 494.9405186494.

Adding to 121243657 its reverse (756342121), we get a palindrome (877585778).

The spelling of 121243657 in words is "one hundred twenty-one million, two hundred forty-three thousand, six hundred fifty-seven".