61513218 has 24 divisors (see below), whose sum is σ = 143531388. Its totient is φ = 18927072.

The previous prime is 61513217. The next prime is 61513219. The reversal of 61513218 is 81231516.

61513218 is a `hidden beast` number, since 615 + 1 + 32 + 18 = 666.

It is an interprime number because it is at equal distance from previous prime (61513217) and next prime (61513219).

It can be written as a sum of positive squares in 2 ways, for example, as 46744569 + 14768649 = 6837^2 + 3843^2 .

It is a junction number, because it is equal to n+sod(n) for n = 61513191 and 61513200.

It is not an unprimeable number, because it can be changed into a prime (61513211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 131205 + ... + 131672.

Almost surely, 2^61513218 is an apocalyptic number.

61513218 is an abundant number, since it is smaller than the sum of its proper divisors (82018170).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61513218 is a wasteful number, since it uses less digits than its factorization.

61513218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262898 (or 262895 counting only the distinct ones).

The product of its digits is 1440, while the sum is 27.

The square root of 61513218 is about 7843.0362743009. The cubic root of 61513218 is about 394.7506154296.

The spelling of 61513218 in words is "sixty-one million, five hundred thirteen thousand, two hundred eighteen".