72947549 has 2 divisors, whose sum is σ = 72947550. Its totient is φ = 72947548.

The previous prime is 72947543. The next prime is 72947551. The reversal of 72947549 is 94574927.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71402500 + 1545049 = 8450^2 + 1243^2 .

It is a cyclic number.

It is not a de Polignac number, because 72947549 - 2¹⁶ = 72882013 is a prime.

Together with 72947551, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72947543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36473774 + 36473775.

It is an arithmetic number, because the mean of its divisors is an integer number (36473775).

Almost surely, 2^72947549 is an apocalyptic number.

It is an amenable number.

72947549 is a deficient number, since it is larger than the sum of its proper divisors (1).

72947549 is an equidigital number, since it uses as much as digits as its factorization.

72947549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 635040, while the sum is 47.

The square root of 72947549 is about 8540.9337311561. The cubic root of 72947549 is about 417.8337995274.

The spelling of 72947549 in words is "seventy-two million, nine hundred forty-seven thousand, five hundred forty-nine".