61329409 has 2 divisors, whose sum is σ = 61329410. Its totient is φ = 61329408.

The previous prime is 61329361. The next prime is 61329413. The reversal of 61329409 is 90492316.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44289025 + 17040384 = 6655^2 + 4128^2 .

It is a cyclic number.

It is not a de Polignac number, because 61329409 - 2²³ = 52940801 is a prime.

It is a super-2 number, since 2×61329409² = 7522592816578562, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (61329419) 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, 30664704 + 30664705.

It is an arithmetic number, because the mean of its divisors is an integer number (30664705).

Almost surely, 2^61329409 is an apocalyptic number.

It is an amenable number.

61329409 is a deficient number, since it is larger than the sum of its proper divisors (1).

61329409 is an equidigital number, since it uses as much as digits as its factorization.

61329409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 61329409 is about 7831.3095328942. The cubic root of 61329409 is about 394.3570354811.

The spelling of 61329409 in words is "sixty-one million, three hundred twenty-nine thousand, four hundred nine".