61347861 has 10 divisors (see below), whose sum is σ = 91643222. Its totient is φ = 40898520.

The previous prime is 61347857. The next prime is 61347889. The reversal of 61347861 is 16874316.

It can be written as a sum of positive squares in only one way, i.e., 43758225 + 17589636 = 6615^2 + 4194^2 .

It is not a de Polignac number, because 61347861 - 2² = 61347857 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 (61347851) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 378610 + ... + 378771.

Almost surely, 2^61347861 is an apocalyptic number.

It is an amenable number.

61347861 is a deficient number, since it is larger than the sum of its proper divisors (30295361).

61347861 is an equidigital number, since it uses as much as digits as its factorization.

61347861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 757393 (or 757384 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 61347861 is about 7832.4875358982. The cubic root of 61347861 is about 394.3965811982.

The spelling of 61347861 in words is "sixty-one million, three hundred forty-seven thousand, eight hundred sixty-one".