61605791 has 8 divisors (see below), whose sum is σ = 67433184. Its totient is φ = 55933920.

The previous prime is 61605787. The next prime is 61605827. The reversal of 61605791 is 19750616.

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 61605791 - 2² = 61605787 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61605991) 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, 38051 + ... + 39636.

It is an arithmetic number, because the mean of its divisors is an integer number (8429148).

Almost surely, 2^61605791 is an apocalyptic number.

61605791 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

61605791 is a deficient number, since it is larger than the sum of its proper divisors (5827393).

61605791 is a wasteful number, since it uses less digits than its factorization.

61605791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77761.

The product of its (nonzero) digits is 11340, while the sum is 35.

The square root of 61605791 is about 7848.9356603300. The cubic root of 61605791 is about 394.9485400034.

The spelling of 61605791 in words is "sixty-one million, six hundred five thousand, seven hundred ninety-one".