121855191131 has 2 divisors, whose sum is σ = 121855191132. Its totient is φ = 121855191130.

The previous prime is 121855191103. The next prime is 121855191187. The reversal of 121855191131 is 131191558121.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121855191131 is a prime.

It is a super-2 number, since 2×121855191131² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (121855191631) 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, 60927595565 + 60927595566.

It is an arithmetic number, because the mean of its divisors is an integer number (60927595566).

Almost surely, 2^121855191131 is an apocalyptic number.

121855191131 is a deficient number, since it is larger than the sum of its proper divisors (1).

121855191131 is an equidigital number, since it uses as much as digits as its factorization.

121855191131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10800, while the sum is 38.

The spelling of 121855191131 in words is "one hundred twenty-one billion, eight hundred fifty-five million, one hundred ninety-one thousand, one hundred thirty-one".