121999457 has 2 divisors, whose sum is σ = 121999458. Its totient is φ = 121999456.

The previous prime is 121999453. The next prime is 121999489. The reversal of 121999457 is 754999121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85951441 + 36048016 = 9271^2 + 6004^2 .

It is a cyclic number.

It is not a de Polignac number, because 121999457 - 2² = 121999453 is a prime.

It is not a weakly prime, because it can be changed into another prime (121999453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60999728 + 60999729.

It is an arithmetic number, because the mean of its divisors is an integer number (60999729).

Almost surely, 2^121999457 is an apocalyptic number.

It is an amenable number.

121999457 is a deficient number, since it is larger than the sum of its proper divisors (1).

121999457 is an equidigital number, since it uses as much as digits as its factorization.

121999457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 204120, while the sum is 47.

The square root of 121999457 is about 11045.3364367049. The cubic root of 121999457 is about 495.9668305624.

The spelling of 121999457 in words is "one hundred twenty-one million, nine hundred ninety-nine thousand, four hundred fifty-seven".