73561539 has 4 divisors (see below), whose sum is σ = 98082056. Its totient is φ = 49041024.

The previous prime is 73561493. The next prime is 73561541. The reversal of 73561539 is 93516537.

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

It is not a de Polignac number, because 73561539 - 2¹¹ = 73559491 is a prime.

It is a super-2 number, since 2×73561539² = 10822600040097042, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 73561497 and 73561506.

It is not an unprimeable number, because it can be changed into a prime (73561639) 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, 12260254 + ... + 12260259.

It is an arithmetic number, because the mean of its divisors is an integer number (24520514).

Almost surely, 2^73561539 is an apocalyptic number.

73561539 is a deficient number, since it is larger than the sum of its proper divisors (24520517).

73561539 is a wasteful number, since it uses less digits than its factorization.

73561539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24520516.

The product of its digits is 85050, while the sum is 39.

The square root of 73561539 is about 8576.8023761773. The cubic root of 73561539 is about 419.0028100206.

The spelling of 73561539 in words is "seventy-three million, five hundred sixty-one thousand, five hundred thirty-nine".