61553539 has 4 divisors (see below), whose sum is σ = 61966800. Its totient is φ = 61140280.

The previous prime is 61553519. The next prime is 61553551. The reversal of 61553539 is 93535516.

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 61553539 - 2⁷ = 61553411 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61553498 and 61553507.

It is not an unprimeable number, because it can be changed into a prime (61553519) 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, 206407 + ... + 206704.

It is an arithmetic number, because the mean of its divisors is an integer number (15491700).

Almost surely, 2^61553539 is an apocalyptic number.

61553539 is a deficient number, since it is larger than the sum of its proper divisors (413261).

61553539 is a wasteful number, since it uses less digits than its factorization.

61553539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 413260.

The product of its digits is 60750, while the sum is 37.

The square root of 61553539 is about 7845.6063500535. The cubic root of 61553539 is about 394.8368476445.

The spelling of 61553539 in words is "sixty-one million, five hundred fifty-three thousand, five hundred thirty-nine".