61791197 has 4 divisors (see below), whose sum is σ = 66544380. Its totient is φ = 57038016.

The previous prime is 61791161. The next prime is 61791203. The reversal of 61791197 is 79119716.

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

It can be written as a sum of positive squares in 2 ways, for example, as 17422276 + 44368921 = 4174^2 + 6661^2 .

It is a cyclic number.

It is not a de Polignac number, because 61791197 - 2²² = 57596893 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 (61791137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2376572 + ... + 2376597.

It is an arithmetic number, because the mean of its divisors is an integer number (16636095).

Almost surely, 2^61791197 is an apocalyptic number.

It is an amenable number.

61791197 is a deficient number, since it is larger than the sum of its proper divisors (4753183).

61791197 is a wasteful number, since it uses less digits than its factorization.

61791197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4753182.

The product of its digits is 23814, while the sum is 41.

The square root of 61791197 is about 7860.7376880290. The cubic root of 61791197 is about 395.3443496145.

The spelling of 61791197 in words is "sixty-one million, seven hundred ninety-one thousand, one hundred ninety-seven".