61199861 has 4 divisors (see below), whose sum is σ = 61217772. Its totient is φ = 61181952.

The previous prime is 61199857. The next prime is 61199867. The reversal of 61199861 is 16899116.

It is a happy number.

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 11764900 + 49434961 = 3430^2 + 7031^2 .

It is a cyclic number.

It is not a de Polignac number, because 61199861 - 2² = 61199857 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 (61199867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2060 + ... + 11253.

It is an arithmetic number, because the mean of its divisors is an integer number (15304443).

Almost surely, 2^61199861 is an apocalyptic number.

It is an amenable number.

61199861 is a deficient number, since it is larger than the sum of its proper divisors (17911).

61199861 is a wasteful number, since it uses less digits than its factorization.

61199861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17910.

The product of its digits is 23328, while the sum is 41.

The square root of 61199861 is about 7823.0340022270. The cubic root of 61199861 is about 394.0791689021.

The spelling of 61199861 in words is "sixty-one million, one hundred ninety-nine thousand, eight hundred sixty-one".