121319257 has 2 divisors, whose sum is σ = 121319258. Its totient is φ = 121319256.

The previous prime is 121319251. The next prime is 121319291. The reversal of 121319257 is 752913121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 112444816 + 8874441 = 10604^2 + 2979^2 .

It is a cyclic number.

It is not a de Polignac number, because 121319257 - 2³ = 121319249 is a prime.

It is not a weakly prime, because it can be changed into another prime (121319251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60659628 + 60659629.

It is an arithmetic number, because the mean of its divisors is an integer number (60659629).

Almost surely, 2^121319257 is an apocalyptic number.

It is an amenable number.

121319257 is a deficient number, since it is larger than the sum of its proper divisors (1).

121319257 is an equidigital number, since it uses as much as digits as its factorization.

121319257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3780, while the sum is 31.

The square root of 121319257 is about 11014.5021222023. The cubic root of 121319257 is about 495.0433686452.

The spelling of 121319257 in words is "one hundred twenty-one million, three hundred nineteen thousand, two hundred fifty-seven".