72130249 has 4 divisors (see below), whose sum is σ = 73146240. Its totient is φ = 71114260.

The previous prime is 72130229. The next prime is 72130283. The reversal of 72130249 is 94203127.

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: 94203127 = 349 ⋅269923.

It is a cyclic number.

It is not a de Polignac number, because 72130249 - 2⁹ = 72129737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72130229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 507889 + ... + 508030.

It is an arithmetic number, because the mean of its divisors is an integer number (18286560).

Almost surely, 2^72130249 is an apocalyptic number.

It is an amenable number.

72130249 is a deficient number, since it is larger than the sum of its proper divisors (1015991).

72130249 is a wasteful number, since it uses less digits than its factorization.

72130249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1015990.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 72130249 is about 8492.9529022596. The cubic root of 72130249 is about 416.2674735275.

It can be divided in two parts, 72 and 130249, that added together give a 4-th power (130321 = 19⁴).

The spelling of 72130249 in words is "seventy-two million, one hundred thirty thousand, two hundred forty-nine".