61708109 has 4 divisors (see below), whose sum is σ = 62018400. Its totient is φ = 61397820.

The previous prime is 61708091. The next prime is 61708111. The reversal of 61708109 is 90180716.

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-61708109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61708169) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 154847 + ... + 155244.

It is an arithmetic number, because the mean of its divisors is an integer number (15504600).

Almost surely, 2^61708109 is an apocalyptic number.

It is an amenable number.

61708109 is a deficient number, since it is larger than the sum of its proper divisors (310291).

61708109 is a wasteful number, since it uses less digits than its factorization.

61708109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310290.

The product of its (nonzero) digits is 3024, while the sum is 32.

The square root of 61708109 is about 7855.4509100369. The cubic root of 61708109 is about 395.1670692079.

The spelling of 61708109 in words is "sixty-one million, seven hundred eight thousand, one hundred nine".