121907783 has 2 divisors, whose sum is σ = 121907784. Its totient is φ = 121907782.

The previous prime is 121907761. The next prime is 121907789. The reversal of 121907783 is 387709121.

It is a strong prime.

It is an emirp because it is prime and its reverse (387709121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121907783 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121907789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60953891 + 60953892.

It is an arithmetic number, because the mean of its divisors is an integer number (60953892).

Almost surely, 2^121907783 is an apocalyptic number.

121907783 is a deficient number, since it is larger than the sum of its proper divisors (1).

121907783 is an equidigital number, since it uses as much as digits as its factorization.

121907783 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21168, while the sum is 38.

The square root of 121907783 is about 11041.1857605965. The cubic root of 121907783 is about 495.8425713851.

The spelling of 121907783 in words is "one hundred twenty-one million, nine hundred seven thousand, seven hundred eighty-three".