73061509 has 4 divisors (see below), whose sum is σ = 73197100. Its totient is φ = 72925920.

The previous prime is 73061477. The next prime is 73061519. The reversal of 73061509 is 90516037.

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 13432225 + 59629284 = 3665^2 + 7722^2 .

It is a cyclic number.

It is not a de Polignac number, because 73061509 - 2⁵ = 73061477 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 (73061519) 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, 66984 + ... + 68065.

It is an arithmetic number, because the mean of its divisors is an integer number (18299275).

Almost surely, 2^73061509 is an apocalyptic number.

It is an amenable number.

73061509 is a deficient number, since it is larger than the sum of its proper divisors (135591).

73061509 is a wasteful number, since it uses less digits than its factorization.

73061509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135590.

The product of its (nonzero) digits is 5670, while the sum is 31.

The square root of 73061509 is about 8547.6025293646. The cubic root of 73061509 is about 418.0512688654.

The spelling of 73061509 in words is "seventy-three million, sixty-one thousand, five hundred nine".