121878667 has 2 divisors, whose sum is σ = 121878668. Its totient is φ = 121878666.

The previous prime is 121878649. The next prime is 121878689. The reversal of 121878667 is 766878121.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121878667 is a prime.

It is not a weakly prime, because it can be changed into another prime (121878637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60939333 + 60939334.

It is an arithmetic number, because the mean of its divisors is an integer number (60939334).

Almost surely, 2^121878667 is an apocalyptic number.

121878667 is a deficient number, since it is larger than the sum of its proper divisors (1).

121878667 is an equidigital number, since it uses as much as digits as its factorization.

121878667 is an evil number, because the sum of its binary digits is even.

The product of its digits is 225792, while the sum is 46.

The square root of 121878667 is about 11039.8671640559. The cubic root of 121878667 is about 495.8030931788.

The spelling of 121878667 in words is "one hundred twenty-one million, eight hundred seventy-eight thousand, six hundred sixty-seven".