73413209 has 2 divisors, whose sum is σ = 73413210. Its totient is φ = 73413208.

The previous prime is 73413167. The next prime is 73413229. The reversal of 73413209 is 90231437.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71453209 + 1960000 = 8453^2 + 1400^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-73413209 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (73413229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36706604 + 36706605.

It is an arithmetic number, because the mean of its divisors is an integer number (36706605).

Almost surely, 2^73413209 is an apocalyptic number.

It is an amenable number.

73413209 is a deficient number, since it is larger than the sum of its proper divisors (1).

73413209 is an equidigital number, since it uses as much as digits as its factorization.

73413209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 29.

The square root of 73413209 is about 8568.1508506795. The cubic root of 73413209 is about 418.7209937880.

It can be divided in two parts, 734 and 13209, that multiplied together give a triangular number (9695406 = T₄₄₀₃).

The spelling of 73413209 in words is "seventy-three million, four hundred thirteen thousand, two hundred nine".