1202121191 has 2 divisors, whose sum is σ = 1202121192. Its totient is φ = 1202121190.

The previous prime is 1202121113. The next prime is 1202121257. The reversal of 1202121191 is 1911212021.

It is a strong prime.

It is an emirp because it is prime and its reverse (1911212021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1202121191 - 2²² = 1197926887 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1202121691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 601060595 + 601060596.

It is an arithmetic number, because the mean of its divisors is an integer number (601060596).

Almost surely, 2^1202121191 is an apocalyptic number.

1202121191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1202121191 is an equidigital number, since it uses as much as digits as its factorization.

1202121191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 20.

The square root of 1202121191 is about 34671.6193881970. The cubic root of 1202121191 is about 1063.2843399978.

The spelling of 1202121191 in words is "one billion, two hundred two million, one hundred twenty-one thousand, one hundred ninety-one".