121881629 has 2 divisors, whose sum is σ = 121881630. Its totient is φ = 121881628.

The previous prime is 121881581. The next prime is 121881631. The reversal of 121881629 is 926188121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 118766404 + 3115225 = 10898^2 + 1765^2 .

It is a cyclic number.

It is not a de Polignac number, because 121881629 - 2²⁴ = 105104413 is a prime.

Together with 121881631, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 121881592 and 121881601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121881659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60940814 + 60940815.

It is an arithmetic number, because the mean of its divisors is an integer number (60940815).

Almost surely, 2^121881629 is an apocalyptic number.

It is an amenable number.

121881629 is a deficient number, since it is larger than the sum of its proper divisors (1).

121881629 is an equidigital number, since it uses as much as digits as its factorization.

121881629 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13824, while the sum is 38.

The square root of 121881629 is about 11040.0013134057. The cubic root of 121881629 is about 495.8071096238.

The spelling of 121881629 in words is "one hundred twenty-one million, eight hundred eighty-one thousand, six hundred twenty-nine".