121994777 has 2 divisors, whose sum is σ = 121994778. Its totient is φ = 121994776.

The previous prime is 121994767. The next prime is 121994797. The reversal of 121994777 is 777499121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110271001 + 11723776 = 10501^2 + 3424^2 .

It is a cyclic number.

It is not a de Polignac number, because 121994777 - 2¹² = 121990681 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (121994707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60997388 + 60997389.

It is an arithmetic number, because the mean of its divisors is an integer number (60997389).

Almost surely, 2^121994777 is an apocalyptic number.

It is an amenable number.

121994777 is a deficient number, since it is larger than the sum of its proper divisors (1).

121994777 is an equidigital number, since it uses as much as digits as its factorization.

121994777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 222264, while the sum is 47.

The square root of 121994777 is about 11045.1245805559. The cubic root of 121994777 is about 495.9604885821.

The spelling of 121994777 in words is "one hundred twenty-one million, nine hundred ninety-four thousand, seven hundred seventy-seven".