121450781 has 2 divisors, whose sum is σ = 121450782. Its totient is φ = 121450780.

The previous prime is 121450759. The next prime is 121450799. The reversal of 121450781 is 187054121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 101505625 + 19945156 = 10075^2 + 4466^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121450781 is a prime.

It is a super-2 number, since 2×121450781² = 29500584411019922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121450711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60725390 + 60725391.

It is an arithmetic number, because the mean of its divisors is an integer number (60725391).

Almost surely, 2^121450781 is an apocalyptic number.

It is an amenable number.

121450781 is a deficient number, since it is larger than the sum of its proper divisors (1).

121450781 is an equidigital number, since it uses as much as digits as its factorization.

121450781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2240, while the sum is 29.

The square root of 121450781 is about 11020.4709971943. The cubic root of 121450781 is about 495.2221986481. Note that the first 3 decimals are identical.

The spelling of 121450781 in words is "one hundred twenty-one million, four hundred fifty thousand, seven hundred eighty-one".