61430209 has 4 divisors (see below), whose sum is σ = 62170416. Its totient is φ = 60690004.

The previous prime is 61430183. The next prime is 61430219. The reversal of 61430209 is 90203416.

61430209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61430209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61430219) 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 in 3 ways as a sum of consecutive naturals, for example, 369979 + ... + 370144.

It is an arithmetic number, because the mean of its divisors is an integer number (15542604).

Almost surely, 2^61430209 is an apocalyptic number.

It is an amenable number.

61430209 is a deficient number, since it is larger than the sum of its proper divisors (740207).

61430209 is an equidigital number, since it uses as much as digits as its factorization.

61430209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 740206.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 61430209 is about 7837.7425959265. The cubic root of 61430209 is about 394.5729701175.

The spelling of 61430209 in words is "sixty-one million, four hundred thirty thousand, two hundred nine".