121509413 has 2 divisors, whose sum is σ = 121509414. Its totient is φ = 121509412.

The previous prime is 121509407. The next prime is 121509433. The reversal of 121509413 is 314905121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76860289 + 44649124 = 8767^2 + 6682^2 .

It is a cyclic number.

It is not a de Polignac number, because 121509413 - 2⁴ = 121509397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121509433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60754706 + 60754707.

It is an arithmetic number, because the mean of its divisors is an integer number (60754707).

Almost surely, 2^121509413 is an apocalyptic number.

It is an amenable number.

121509413 is a deficient number, since it is larger than the sum of its proper divisors (1).

121509413 is an equidigital number, since it uses as much as digits as its factorization.

121509413 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 121509413 is about 11023.1308166056. The cubic root of 121509413 is about 495.3018775558.

The spelling of 121509413 in words is "one hundred twenty-one million, five hundred nine thousand, four hundred thirteen".