121317745 has 4 divisors (see below), whose sum is σ = 145581300. Its totient is φ = 97054192.

The previous prime is 121317743. The next prime is 121317761. The reversal of 121317745 is 547713121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 547713121 = 3347 ⋅163643.

It can be written as a sum of positive squares in 2 ways, for example, as 88059456 + 33258289 = 9384^2 + 5767^2 .

It is a cyclic number.

It is not a de Polignac number, because 121317745 - 2¹ = 121317743 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121317743) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12131770 + ... + 12131779.

It is an arithmetic number, because the mean of its divisors is an integer number (36395325).

Almost surely, 2^121317745 is an apocalyptic number.

It is an amenable number.

121317745 is a deficient number, since it is larger than the sum of its proper divisors (24263555).

121317745 is an equidigital number, since it uses as much as digits as its factorization.

121317745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24263554.

The product of its digits is 5880, while the sum is 31.

The square root of 121317745 is about 11014.4334852048. The cubic root of 121317745 is about 495.0413120641.

The spelling of 121317745 in words is "one hundred twenty-one million, three hundred seventeen thousand, seven hundred forty-five".