73145249 has 4 divisors (see below), whose sum is σ = 73320240. Its totient is φ = 72970260.

The previous prime is 73145209. The next prime is 73145251. The reversal of 73145249 is 94254137.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 94254137 = 17 ⋅5544361.

It is a cyclic number.

It is not a de Polignac number, because 73145249 - 2⁸ = 73144993 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (73145209) 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, 86867 + ... + 87704.

It is an arithmetic number, because the mean of its divisors is an integer number (18330060).

Almost surely, 2^73145249 is an apocalyptic number.

It is an amenable number.

73145249 is a deficient number, since it is larger than the sum of its proper divisors (174991).

73145249 is a wasteful number, since it uses less digits than its factorization.

73145249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174990.

The product of its digits is 30240, while the sum is 35.

The square root of 73145249 is about 8552.4995761473. The cubic root of 73145249 is about 418.2109254228.

The spelling of 73145249 in words is "seventy-three million, one hundred forty-five thousand, two hundred forty-nine".