72106549 has 2 divisors, whose sum is σ = 72106550. Its totient is φ = 72106548.

The previous prime is 72106547. The next prime is 72106579. The reversal of 72106549 is 94560127.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70442449 + 1664100 = 8393^2 + 1290^2 .

It is an emirp because it is prime and its reverse (94560127) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72106549 - 2¹ = 72106547 is a prime.

Together with 72106547, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72106547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36053274 + 36053275.

It is an arithmetic number, because the mean of its divisors is an integer number (36053275).

Almost surely, 2^72106549 is an apocalyptic number.

It is an amenable number.

72106549 is a deficient number, since it is larger than the sum of its proper divisors (1).

72106549 is an equidigital number, since it uses as much as digits as its factorization.

72106549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 72106549 is about 8491.5575132010. The cubic root of 72106549 is about 416.2218772164.

The spelling of 72106549 in words is "seventy-two million, one hundred six thousand, five hundred forty-nine".