61545213 has 6 divisors (see below), whose sum is σ = 88898654. Its totient is φ = 41030136.

The previous prime is 61545203. The next prime is 61545227. The reversal of 61545213 is 31254516.

61545213 is a `hidden beast` number, since 615 + 45 + 2 + 1 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 36324729 + 25220484 = 6027^2 + 5022^2 .

It is not a de Polignac number, because 61545213 - 2⁸ = 61544957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61545203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3419170 + ... + 3419187.

Almost surely, 2^61545213 is an apocalyptic number.

It is an amenable number.

61545213 is a deficient number, since it is larger than the sum of its proper divisors (27353441).

61545213 is a wasteful number, since it uses less digits than its factorization.

61545213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6838363 (or 6838360 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 61545213 is about 7845.0757166518. The cubic root of 61545213 is about 394.8190443907.

Adding to 61545213 its reverse (31254516), we get a palindrome (92799729).

The spelling of 61545213 in words is "sixty-one million, five hundred forty-five thousand, two hundred thirteen".