61280761 has 4 divisors (see below), whose sum is σ = 61499124. Its totient is φ = 61062400.

The previous prime is 61280729. The next prime is 61280771. The reversal of 61280761 is 16708216.

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 26988025 + 34292736 = 5195^2 + 5856^2 .

It is a cyclic number.

It is not a de Polignac number, because 61280761 - 2⁵ = 61280729 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61280701) 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, 108760 + ... + 109321.

It is an arithmetic number, because the mean of its divisors is an integer number (15374781).

Almost surely, 2^61280761 is an apocalyptic number.

It is an amenable number.

61280761 is a deficient number, since it is larger than the sum of its proper divisors (218363).

61280761 is a wasteful number, since it uses less digits than its factorization.

61280761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218362.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 61280761 is about 7828.2029227659. The cubic root of 61280761 is about 394.2527366561.

Adding to 61280761 its reverse (16708216), we get a palindrome (77988977).

The spelling of 61280761 in words is "sixty-one million, two hundred eighty thousand, seven hundred sixty-one".