61539213 has 4 divisors (see below), whose sum is σ = 82052288. Its totient is φ = 41026140.

The previous prime is 61539209. The next prime is 61539217. The reversal of 61539213 is 31293516.

61539213 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (61539209) and next prime (61539217).

It is not a de Polignac number, because 61539213 - 2² = 61539209 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61539217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10256533 + ... + 10256538.

It is an arithmetic number, because the mean of its divisors is an integer number (20513072).

Almost surely, 2^61539213 is an apocalyptic number.

It is an amenable number.

61539213 is a deficient number, since it is larger than the sum of its proper divisors (20513075).

61539213 is a wasteful number, since it uses less digits than its factorization.

61539213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20513074.

The product of its digits is 4860, while the sum is 30.

The square root of 61539213 is about 7844.6933018442. The cubic root of 61539213 is about 394.8062137624.

The spelling of 61539213 in words is "sixty-one million, five hundred thirty-nine thousand, two hundred thirteen".