72981269 has 2 divisors, whose sum is σ = 72981270. Its totient is φ = 72981268.

The previous prime is 72981241. The next prime is 72981281. The reversal of 72981269 is 96218927.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39225169 + 33756100 = 6263^2 + 5810^2 .

It is a cyclic number.

It is not a de Polignac number, because 72981269 - 2¹² = 72977173 is a prime.

It is a super-2 number, since 2×72981269² = 10652531249700722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72981229) 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, 36490634 + 36490635.

It is an arithmetic number, because the mean of its divisors is an integer number (36490635).

Almost surely, 2^72981269 is an apocalyptic number.

It is an amenable number.

72981269 is a deficient number, since it is larger than the sum of its proper divisors (1).

72981269 is an equidigital number, since it uses as much as digits as its factorization.

72981269 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 44.

The square root of 72981269 is about 8542.9075261295. The cubic root of 72981269 is about 417.8981708258.

The spelling of 72981269 in words is "seventy-two million, nine hundred eighty-one thousand, two hundred sixty-nine".