61318765 has 4 divisors (see below), whose sum is σ = 73582524. Its totient is φ = 49055008.

The previous prime is 61318753. The next prime is 61318769. The reversal of 61318765 is 56781316.

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 17189316 + 44129449 = 4146^2 + 6643^2 .

It is a cyclic number.

It is not a de Polignac number, because 61318765 - 2¹³ = 61310573 is a prime.

It is a super-2 number, since 2×61318765² = 7519981882250450, 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 (61318769) 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, 6131872 + ... + 6131881.

It is an arithmetic number, because the mean of its divisors is an integer number (18395631).

Almost surely, 2^61318765 is an apocalyptic number.

It is an amenable number.

61318765 is a deficient number, since it is larger than the sum of its proper divisors (12263759).

61318765 is a wasteful number, since it uses less digits than its factorization.

61318765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12263758.

The product of its digits is 30240, while the sum is 37.

The square root of 61318765 is about 7830.6299235758. The cubic root of 61318765 is about 394.3342200042.

The spelling of 61318765 in words is "sixty-one million, three hundred eighteen thousand, seven hundred sixty-five".