73745509 has 2 divisors, whose sum is σ = 73745510. Its totient is φ = 73745508.

The previous prime is 73745467. The next prime is 73745519. The reversal of 73745509 is 90554737.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63202500 + 10543009 = 7950^2 + 3247^2 .

It is a cyclic number.

It is not a de Polignac number, because 73745509 - 2¹³ = 73737317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73745519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36872754 + 36872755.

It is an arithmetic number, because the mean of its divisors is an integer number (36872755).

Almost surely, 2^73745509 is an apocalyptic number.

It is an amenable number.

73745509 is a deficient number, since it is larger than the sum of its proper divisors (1).

73745509 is an equidigital number, since it uses as much as digits as its factorization.

73745509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 132300, while the sum is 40.

The square root of 73745509 is about 8587.5205385489. The cubic root of 73745509 is about 419.3518138497.

The spelling of 73745509 in words is "seventy-three million, seven hundred forty-five thousand, five hundred nine".