61418213 has 4 divisors (see below), whose sum is σ = 61442700. Its totient is φ = 61393728.

The previous prime is 61418209. The next prime is 61418219. The reversal of 61418213 is 31281416.

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 10252804 + 51165409 = 3202^2 + 7153^2 .

It is a cyclic number.

It is not a de Polignac number, because 61418213 - 2² = 61418209 is a prime.

It is a super-2 number, since 2×61418213² = 7544393776226738, 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 (61418219) 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, 7988 + ... + 13661.

It is an arithmetic number, because the mean of its divisors is an integer number (15360675).

Almost surely, 2^61418213 is an apocalyptic number.

It is an amenable number.

61418213 is a deficient number, since it is larger than the sum of its proper divisors (24487).

61418213 is a wasteful number, since it uses less digits than its factorization.

61418213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24486.

The product of its digits is 1152, while the sum is 26.

The square root of 61418213 is about 7836.9772871943. The cubic root of 61418213 is about 394.5472845709.

Adding to 61418213 its reverse (31281416), we get a palindrome (92699629).

The spelling of 61418213 in words is "sixty-one million, four hundred eighteen thousand, two hundred thirteen".