121431379 has 2 divisors, whose sum is σ = 121431380. Its totient is φ = 121431378.

The previous prime is 121431377. The next prime is 121431383. The reversal of 121431379 is 973134121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121431379 - 2¹ = 121431377 is a prime.

Together with 121431377, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 121431379.

It is not a weakly prime, because it can be changed into another prime (121431377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60715689 + 60715690.

It is an arithmetic number, because the mean of its divisors is an integer number (60715690).

Almost surely, 2^121431379 is an apocalyptic number.

121431379 is a deficient number, since it is larger than the sum of its proper divisors (1).

121431379 is an equidigital number, since it uses as much as digits as its factorization.

121431379 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4536, while the sum is 31.

The square root of 121431379 is about 11019.5906911282. The cubic root of 121431379 is about 495.1958263385.

The spelling of 121431379 in words is "one hundred twenty-one million, four hundred thirty-one thousand, three hundred seventy-nine".