121197997 has 2 divisors, whose sum is σ = 121197998. Its totient is φ = 121197996.

The previous prime is 121197959. The next prime is 121198001. The reversal of 121197997 is 799791121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78960996 + 42237001 = 8886^2 + 6499^2 .

It is a cyclic number.

It is not a de Polignac number, because 121197997 - 2¹⁵ = 121165229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121197907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60598998 + 60598999.

It is an arithmetic number, because the mean of its divisors is an integer number (60598999).

Almost surely, 2^121197997 is an apocalyptic number.

It is an amenable number.

121197997 is a deficient number, since it is larger than the sum of its proper divisors (1).

121197997 is an equidigital number, since it uses as much as digits as its factorization.

121197997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 71442, while the sum is 46.

The square root of 121197997 is about 11008.9961849389. The cubic root of 121197997 is about 494.8783798068.

The spelling of 121197997 in words is "one hundred twenty-one million, one hundred ninety-seven thousand, nine hundred ninety-seven".