121551197 has 2 divisors, whose sum is σ = 121551198. Its totient is φ = 121551196.

The previous prime is 121551193. The next prime is 121551229. The reversal of 121551197 is 791155121.

It is a happy number.

It is an a-pointer prime, because the next prime (121551229) can be obtained adding 121551197 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72914521 + 48636676 = 8539^2 + 6974^2 .

It is a cyclic number.

It is not a de Polignac number, because 121551197 - 2² = 121551193 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121551193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60775598 + 60775599.

It is an arithmetic number, because the mean of its divisors is an integer number (60775599).

Almost surely, 2^121551197 is an apocalyptic number.

It is an amenable number.

121551197 is a deficient number, since it is larger than the sum of its proper divisors (1).

121551197 is an equidigital number, since it uses as much as digits as its factorization.

121551197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3150, while the sum is 32.

The square root of 121551197 is about 11025.0259410126. The cubic root of 121551197 is about 495.3586449600.

The spelling of 121551197 in words is "one hundred twenty-one million, five hundred fifty-one thousand, one hundred ninety-seven".