61453409 has 2 divisors, whose sum is σ = 61453410. Its totient is φ = 61453408.

The previous prime is 61453387. The next prime is 61453423. The reversal of 61453409 is 90435416.

61453409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61230625 + 222784 = 7825^2 + 472^2 .

It is a cyclic number.

It is not a de Polignac number, because 61453409 - 2⁸ = 61453153 is a prime.

It is not a weakly prime, because it can be changed into another prime (61453009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30726704 + 30726705.

It is an arithmetic number, because the mean of its divisors is an integer number (30726705).

Almost surely, 2^61453409 is an apocalyptic number.

It is an amenable number.

61453409 is a deficient number, since it is larger than the sum of its proper divisors (1).

61453409 is an equidigital number, since it uses as much as digits as its factorization.

61453409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 61453409 is about 7839.2224741998. Note that the first 3 decimals coincide. The cubic root of 61453409 is about 394.6226359139.

The spelling of 61453409 in words is "sixty-one million, four hundred fifty-three thousand, four hundred nine".