121287923 has 2 divisors, whose sum is σ = 121287924. Its totient is φ = 121287922.

The previous prime is 121287863. The next prime is 121287931. The reversal of 121287923 is 329782121.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121287923 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (121287953) 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, 60643961 + 60643962.

It is an arithmetic number, because the mean of its divisors is an integer number (60643962).

Almost surely, 2^121287923 is an apocalyptic number.

121287923 is a deficient number, since it is larger than the sum of its proper divisors (1).

121287923 is an equidigital number, since it uses as much as digits as its factorization.

121287923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 35.

The square root of 121287923 is about 11013.0796328729. The cubic root of 121287923 is about 495.0007455010. Note that the first 3 decimals are identical.

The spelling of 121287923 in words is "one hundred twenty-one million, two hundred eighty-seven thousand, nine hundred twenty-three".