121845389 has 2 divisors, whose sum is σ = 121845390. Its totient is φ = 121845388.

The previous prime is 121845379. The next prime is 121845419. The reversal of 121845389 is 983548121.

121845389 = 6372² + 6373² + 6374².

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64722025 + 57123364 = 8045^2 + 7558^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121845389 is a prime.

It is a super-2 number, since 2×121845389² = 29692597641122642, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121845349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60922694 + 60922695.

It is an arithmetic number, because the mean of its divisors is an integer number (60922695).

Almost surely, 2^121845389 is an apocalyptic number.

It is an amenable number.

121845389 is a deficient number, since it is larger than the sum of its proper divisors (1).

121845389 is an equidigital number, since it uses as much as digits as its factorization.

121845389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69120, while the sum is 41.

The square root of 121845389 is about 11038.3598872296. The cubic root of 121845389 is about 495.7579640417.

The spelling of 121845389 in words is "one hundred twenty-one million, eight hundred forty-five thousand, three hundred eighty-nine".