121352257 has 8 divisors (see below), whose sum is σ = 130977000. Its totient is φ = 111768960.

The previous prime is 121352249. The next prime is 121352263. The reversal of 121352257 is 752253121.

It is a Cunningham number, because it is equal to 11016²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 1 + 121352256 = 1^2 + 11016^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121352257 - 2³ = 121352249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121352857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4132 + ... + 16117.

It is an arithmetic number, because the mean of its divisors is an integer number (16372125).

Almost surely, 2^121352257 is an apocalyptic number.

It is an amenable number.

121352257 is a deficient number, since it is larger than the sum of its proper divisors (9624743).

121352257 is a wasteful number, since it uses less digits than its factorization.

121352257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20723.

The product of its digits is 4200, while the sum is 28.

The square root of 121352257 is about 11016.0000453885. Note that the first 4 decimals coincide. The cubic root of 121352257 is about 495.0882500888.

The spelling of 121352257 in words is "one hundred twenty-one million, three hundred fifty-two thousand, two hundred fifty-seven".