61438609 has 8 divisors (see below), whose sum is σ = 65147040. Its totient is φ = 57777696.

The previous prime is 61438583. The next prime is 61438633. The reversal of 61438609 is 90683416.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61438609 - 2¹¹ = 61436561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61438669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9199 + ... + 14404.

It is an arithmetic number, because the mean of its divisors is an integer number (8143380).

Almost surely, 2^61438609 is an apocalyptic number.

It is an amenable number.

61438609 is a deficient number, since it is larger than the sum of its proper divisors (3708431).

61438609 is a wasteful number, since it uses less digits than its factorization.

61438609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23759.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 61438609 is about 7838.2784461896. The cubic root of 61438609 is about 394.5909540050.

The spelling of 61438609 in words is "sixty-one million, four hundred thirty-eight thousand, six hundred nine".