61380505 has 4 divisors (see below), whose sum is σ = 73656612. Its totient is φ = 49104400.

The previous prime is 61380503. The next prime is 61380547. The reversal of 61380505 is 50508316.

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 11861136 + 49519369 = 3444^2 + 7037^2 .

It is not a de Polignac number, because 61380505 - 2¹ = 61380503 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61380503) 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, 6138046 + ... + 6138055.

It is an arithmetic number, because the mean of its divisors is an integer number (18414153).

Almost surely, 2^61380505 is an apocalyptic number.

It is an amenable number.

61380505 is a deficient number, since it is larger than the sum of its proper divisors (12276107).

61380505 is a wasteful number, since it uses less digits than its factorization.

61380505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12276106.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 61380505 is about 7834.5711433364. The cubic root of 61380505 is about 394.4665233220.

It can be divided in two parts, 613 and 80505, that added together give a palindrome (81118).

The spelling of 61380505 in words is "sixty-one million, three hundred eighty thousand, five hundred five".