121540849 has 2 divisors, whose sum is σ = 121540850. Its totient is φ = 121540848.

The previous prime is 121540847. The next prime is 121540877. The reversal of 121540849 is 948045121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 98644624 + 22896225 = 9932^2 + 4785^2 .

It is a cyclic number.

It is not a de Polignac number, because 121540849 - 2¹ = 121540847 is a prime.

Together with 121540847, it forms a pair of twin primes.

It is equal to p_6924355 and since 121540849 and 6924355 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (121540847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60770424 + 60770425.

It is an arithmetic number, because the mean of its divisors is an integer number (60770425).

Almost surely, 2^121540849 is an apocalyptic number.

It is an amenable number.

121540849 is a deficient number, since it is larger than the sum of its proper divisors (1).

121540849 is an equidigital number, since it uses as much as digits as its factorization.

121540849 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 121540849 is about 11024.5566350761. The cubic root of 121540849 is about 495.3445874631.

The spelling of 121540849 in words is "one hundred twenty-one million, five hundred forty thousand, eight hundred forty-nine".