121399547 has 2 divisors, whose sum is σ = 121399548. Its totient is φ = 121399546.

The previous prime is 121399519. The next prime is 121399559. The reversal of 121399547 is 745993121.

It is a strong prime.

It is an emirp because it is prime and its reverse (745993121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121399547 - 2¹⁶ = 121334011 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (121399247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60699773 + 60699774.

It is an arithmetic number, because the mean of its divisors is an integer number (60699774).

Almost surely, 2^121399547 is an apocalyptic number.

121399547 is a deficient number, since it is larger than the sum of its proper divisors (1).

121399547 is an equidigital number, since it uses as much as digits as its factorization.

121399547 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 68040, while the sum is 41.

The square root of 121399547 is about 11018.1462596936. The cubic root of 121399547 is about 495.1525523752.

The spelling of 121399547 in words is "one hundred twenty-one million, three hundred ninety-nine thousand, five hundred forty-seven".