73139609549 has 4 divisors (see below), whose sum is σ = 74519602236. Its totient is φ = 71759616864.

The previous prime is 73139609509. The next prime is 73139609551. The reversal of 73139609549 is 94590693137.

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

It can be written as a sum of positive squares in 2 ways, for example, as 39790275625 + 33349333924 = 199475^2 + 182618^2 .

It is a cyclic number.

It is not a de Polignac number, because 73139609549 - 2¹⁶ = 73139544013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 73139609494 and 73139609503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73139609509) 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, 689996264 + ... + 689996369.

It is an arithmetic number, because the mean of its divisors is an integer number (18629900559).

Almost surely, 2^73139609549 is an apocalyptic number.

It is an amenable number.

73139609549 is a deficient number, since it is larger than the sum of its proper divisors (1379992687).

73139609549 is a wasteful number, since it uses less digits than its factorization.

73139609549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1379992686.

The product of its (nonzero) digits is 5511240, while the sum is 56.

The spelling of 73139609549 in words is "seventy-three billion, one hundred thirty-nine million, six hundred nine thousand, five hundred forty-nine".