121749197 has 2 divisors, whose sum is σ = 121749198. Its totient is φ = 121749196.

The previous prime is 121749157. The next prime is 121749209. The reversal of 121749197 is 791947121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85581001 + 36168196 = 9251^2 + 6014^2 .

It is a cyclic number.

It is not a de Polignac number, because 121749197 - 2¹⁸ = 121487053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121749157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60874598 + 60874599.

It is an arithmetic number, because the mean of its divisors is an integer number (60874599).

Almost surely, 2^121749197 is an apocalyptic number.

It is an amenable number.

121749197 is a deficient number, since it is larger than the sum of its proper divisors (1).

121749197 is an equidigital number, since it uses as much as digits as its factorization.

121749197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31752, while the sum is 41.

The square root of 121749197 is about 11034.0018578936. The cubic root of 121749197 is about 495.6274694173.

Subtracting from 121749197 its sum of digits (41), we obtain a square (121749156 = 11034²).

The spelling of 121749197 in words is "one hundred twenty-one million, seven hundred forty-nine thousand, one hundred ninety-seven".