121287851 has 2 divisors, whose sum is σ = 121287852. Its totient is φ = 121287850.

The previous prime is 121287847. The next prime is 121287863. The reversal of 121287851 is 158782121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121287851 - 2² = 121287847 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (121277851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60643925 + 60643926.

It is an arithmetic number, because the mean of its divisors is an integer number (60643926).

Almost surely, 2^121287851 is an apocalyptic number.

121287851 is a deficient number, since it is larger than the sum of its proper divisors (1).

121287851 is an equidigital number, since it uses as much as digits as its factorization.

121287851 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8960, while the sum is 35.

The square root of 121287851 is about 11013.0763640320. The cubic root of 121287851 is about 495.0006475521. Note that the first 3 decimals are identical.

The spelling of 121287851 in words is "one hundred twenty-one million, two hundred eighty-seven thousand, eight hundred fifty-one".