121620449 has 2 divisors, whose sum is σ = 121620450. Its totient is φ = 121620448.

The previous prime is 121620439. The next prime is 121620467. The reversal of 121620449 is 944026121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120846049 + 774400 = 10993^2 + 880^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121620449 is a prime.

It is a super-2 number, since 2×121620449² = 29583067229923202, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (121620419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60810224 + 60810225.

It is an arithmetic number, because the mean of its divisors is an integer number (60810225).

Almost surely, 2^121620449 is an apocalyptic number.

It is an amenable number.

121620449 is a deficient number, since it is larger than the sum of its proper divisors (1).

121620449 is an equidigital number, since it uses as much as digits as its factorization.

121620449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 121620449 is about 11028.1661666843. The cubic root of 121620449 is about 495.4527015247.

The spelling of 121620449 in words is "one hundred twenty-one million, six hundred twenty thousand, four hundred forty-nine".