61534639 has 4 divisors (see below), whose sum is σ = 61551000. Its totient is φ = 61518280.

The previous prime is 61534631. The next prime is 61534667. The reversal of 61534639 is 93643516.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61534639 - 2³ = 61534631 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61534598 and 61534607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61534631) 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 3 ways as a sum of consecutive naturals, for example, 612 + ... + 11110.

It is an arithmetic number, because the mean of its divisors is an integer number (15387750).

Almost surely, 2^61534639 is an apocalyptic number.

61534639 is a deficient number, since it is larger than the sum of its proper divisors (16361).

61534639 is a wasteful number, since it uses less digits than its factorization.

61534639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16360.

The product of its digits is 58320, while the sum is 37.

The square root of 61534639 is about 7844.4017617662. The cubic root of 61534639 is about 394.7964319866.

The spelling of 61534639 in words is "sixty-one million, five hundred thirty-four thousand, six hundred thirty-nine".