61520213 has 16 divisors (see below), whose sum is σ = 65856000. Its totient is φ = 57369600.

The previous prime is 61520203. The next prime is 61520219. The reversal of 61520213 is 31202516.

It is a cyclic number.

It is not a de Polignac number, because 61520213 - 2¹⁰ = 61519189 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 (61520219) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 123038 + ... + 123536.

It is an arithmetic number, because the mean of its divisors is an integer number (4116000).

Almost surely, 2^61520213 is an apocalyptic number.

It is an amenable number.

61520213 is a deficient number, since it is larger than the sum of its proper divisors (4335787).

61520213 is a wasteful number, since it uses less digits than its factorization.

61520213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 668.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 61520213 is about 7843.4821986156. The cubic root of 61520213 is about 394.7655779367.

Adding to 61520213 its reverse (31202516), we get a palindrome (92722729).

The spelling of 61520213 in words is "sixty-one million, five hundred twenty thousand, two hundred thirteen".