72981229 has 2 divisors, whose sum is σ = 72981230. Its totient is φ = 72981228.

The previous prime is 72981199. The next prime is 72981241. The reversal of 72981229 is 92218927.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72284004 + 697225 = 8502^2 + 835^2 .

It is a cyclic number.

It is not a de Polignac number, because 72981229 - 2⁹ = 72980717 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 72981191 and 72981200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72981269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36490614 + 36490615.

It is an arithmetic number, because the mean of its divisors is an integer number (36490615).

Almost surely, 2^72981229 is an apocalyptic number.

It is an amenable number.

72981229 is a deficient number, since it is larger than the sum of its proper divisors (1).

72981229 is an equidigital number, since it uses as much as digits as its factorization.

72981229 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 40.

The square root of 72981229 is about 8542.9051850059. The cubic root of 72981229 is about 417.8980944778.

The spelling of 72981229 in words is "seventy-two million, nine hundred eighty-one thousand, two hundred twenty-nine".