121171957 has 2 divisors, whose sum is σ = 121171958. Its totient is φ = 121171956.

The previous prime is 121171951. The next prime is 121171991. The reversal of 121171957 is 759171121.

It is an a-pointer prime, because the next prime (121171991) can be obtained adding 121171957 to its sum of digits (34).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 116445681 + 4726276 = 10791^2 + 2174^2 .

It is a cyclic number.

It is not a de Polignac number, because 121171957 - 2¹⁹ = 120647669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121171951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60585978 + 60585979.

It is an arithmetic number, because the mean of its divisors is an integer number (60585979).

Almost surely, 2^121171957 is an apocalyptic number.

It is an amenable number.

121171957 is a deficient number, since it is larger than the sum of its proper divisors (1).

121171957 is an equidigital number, since it uses as much as digits as its factorization.

121171957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4410, while the sum is 34.

The square root of 121171957 is about 11007.8134522711. The cubic root of 121171957 is about 494.8429348975.

The spelling of 121171957 in words is "one hundred twenty-one million, one hundred seventy-one thousand, nine hundred fifty-seven".