61055791 has 4 divisors (see below), whose sum is σ = 61136784. Its totient is φ = 60974800.

The previous prime is 61055749. The next prime is 61055801. The reversal of 61055791 is 19755016.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61055791 - 2¹¹ = 61053743 is a prime.

It is a super-2 number, since 2×61055791² = 7455619229271362, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61058791) 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, 39355 + ... + 40876.

It is an arithmetic number, because the mean of its divisors is an integer number (15284196).

Almost surely, 2^61055791 is an apocalyptic number.

61055791 is a deficient number, since it is larger than the sum of its proper divisors (80993).

61055791 is an equidigital number, since it uses as much as digits as its factorization.

61055791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80992.

The product of its (nonzero) digits is 9450, while the sum is 34.

The square root of 61055791 is about 7813.8205123998. The cubic root of 61055791 is about 393.7696932789.

The spelling of 61055791 in words is "sixty-one million, fifty-five thousand, seven hundred ninety-one".