121754531881 has 2 divisors, whose sum is σ = 121754531882. Its totient is φ = 121754531880.

The previous prime is 121754531867. The next prime is 121754531897. The reversal of 121754531881 is 188135457121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118625136400 + 3129395481 = 344420^2 + 55941^2 .

It is a cyclic number.

It is not a de Polignac number, because 121754531881 - 2⁵ = 121754531849 is a prime.

It is a super-2 number, since 2×121754531881² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (121754561881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60877265940 + 60877265941.

It is an arithmetic number, because the mean of its divisors is an integer number (60877265941).

Almost surely, 2^121754531881 is an apocalyptic number.

It is an amenable number.

121754531881 is a deficient number, since it is larger than the sum of its proper divisors (1).

121754531881 is an equidigital number, since it uses as much as digits as its factorization.

121754531881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 268800, while the sum is 46.

The spelling of 121754531881 in words is "one hundred twenty-one billion, seven hundred fifty-four million, five hundred thirty-one thousand, eight hundred eighty-one".