121669139 has 2 divisors, whose sum is σ = 121669140. Its totient is φ = 121669138.

The previous prime is 121669133. The next prime is 121669157. The reversal of 121669139 is 931966121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121669139 - 2¹² = 121665043 is a prime.

It is not a weakly prime, because it can be changed into another prime (121669133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60834569 + 60834570.

It is an arithmetic number, because the mean of its divisors is an integer number (60834570).

Almost surely, 2^121669139 is an apocalyptic number.

121669139 is a deficient number, since it is larger than the sum of its proper divisors (1).

121669139 is an equidigital number, since it uses as much as digits as its factorization.

121669139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17496, while the sum is 38.

The square root of 121669139 is about 11030.3734750914. The cubic root of 121669139 is about 495.5188098525.

The spelling of 121669139 in words is "one hundred twenty-one million, six hundred sixty-nine thousand, one hundred thirty-nine".