61438209 has 12 divisors (see below), whose sum is σ = 95292144. Its totient is φ = 35107464.

The previous prime is 61438189. The next prime is 61438219. The reversal of 61438209 is 90283416.

It is not a de Polignac number, because 61438209 - 2⁸ = 61437953 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61438209.

It is not an unprimeable number, because it can be changed into a prime (61438219) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 208827 + ... + 209120.

It is an arithmetic number, because the mean of its divisors is an integer number (7941012).

Almost surely, 2^61438209 is an apocalyptic number.

It is an amenable number.

61438209 is a deficient number, since it is larger than the sum of its proper divisors (33853935).

61438209 is a wasteful number, since it uses less digits than its factorization.

61438209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417964 (or 417957 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 61438209 is about 7838.2529303410. The cubic root of 61438209 is about 394.5900976665.

The spelling of 61438209 in words is "sixty-one million, four hundred thirty-eight thousand, two hundred nine".