121520873 has 2 divisors, whose sum is σ = 121520874. Its totient is φ = 121520872.

The previous prime is 121520869. The next prime is 121520887. The reversal of 121520873 is 378025121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 105616729 + 15904144 = 10277^2 + 3988^2 .

It is a cyclic number.

It is not a de Polignac number, because 121520873 - 2² = 121520869 is a prime.

It is not a weakly prime, because it can be changed into another prime (121520813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60760436 + 60760437.

It is an arithmetic number, because the mean of its divisors is an integer number (60760437).

Almost surely, 2^121520873 is an apocalyptic number.

It is an amenable number.

121520873 is a deficient number, since it is larger than the sum of its proper divisors (1).

121520873 is an equidigital number, since it uses as much as digits as its factorization.

121520873 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 121520873 is about 11023.6506203707. The cubic root of 121520873 is about 495.3174483141.

Adding to 121520873 its reverse (378025121), we get a palindrome (499545994).

The spelling of 121520873 in words is "one hundred twenty-one million, five hundred twenty thousand, eight hundred seventy-three".