121954092157 has 2 divisors, whose sum is σ = 121954092158. Its totient is φ = 121954092156.

The previous prime is 121954092133. The next prime is 121954092199. The reversal of 121954092157 is 751290459121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120765980196 + 1188111961 = 347514^2 + 34469^2 .

It is an emirp because it is prime and its reverse (751290459121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121954092157 - 2³⁵ = 87594353789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121954092107) 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, 60977046078 + 60977046079.

It is an arithmetic number, because the mean of its divisors is an integer number (60977046079).

Almost surely, 2^121954092157 is an apocalyptic number.

It is an amenable number.

121954092157 is a deficient number, since it is larger than the sum of its proper divisors (1).

121954092157 is an equidigital number, since it uses as much as digits as its factorization.

121954092157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 226800, while the sum is 46.

The spelling of 121954092157 in words is "one hundred twenty-one billion, nine hundred fifty-four million, ninety-two thousand, one hundred fifty-seven".