72545449 has 2 divisors, whose sum is σ = 72545450. Its totient is φ = 72545448.

The previous prime is 72545399. The next prime is 72545453. The reversal of 72545449 is 94454527.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72369049 + 176400 = 8507^2 + 420^2 .

It is a cyclic number.

It is not a de Polignac number, because 72545449 - 2⁹ = 72544937 is a prime.

It is a super-2 number, since 2×72545449² = 10525684341223202, which contains 22 as substring.

It is equal to p_4258948 and since 72545449 and 4258948 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (72545479) 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 as a sum of consecutive naturals, namely, 36272724 + 36272725.

It is an arithmetic number, because the mean of its divisors is an integer number (36272725).

Almost surely, 2^72545449 is an apocalyptic number.

It is an amenable number.

72545449 is a deficient number, since it is larger than the sum of its proper divisors (1).

72545449 is an equidigital number, since it uses as much as digits as its factorization.

72545449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 201600, while the sum is 40.

The square root of 72545449 is about 8517.3616220048. The cubic root of 72545449 is about 417.0646595807.

The spelling of 72545449 in words is "seventy-two million, five hundred forty-five thousand, four hundred forty-nine".