72251213 has 2 divisors, whose sum is σ = 72251214. Its totient is φ = 72251212.

The previous prime is 72251191. The next prime is 72251237. The reversal of 72251213 is 31215227.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48260809 + 23990404 = 6947^2 + 4898^2 .

It is a cyclic number.

It is not a de Polignac number, because 72251213 - 2¹⁶ = 72185677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72251273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36125606 + 36125607.

It is an arithmetic number, because the mean of its divisors is an integer number (36125607).

Almost surely, 2^72251213 is an apocalyptic number.

It is an amenable number.

72251213 is a deficient number, since it is larger than the sum of its proper divisors (1).

72251213 is an equidigital number, since it uses as much as digits as its factorization.

72251213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 840, while the sum is 23.

The square root of 72251213 is about 8500.0713526417. The cubic root of 72251213 is about 416.5000401121.

The spelling of 72251213 in words is "seventy-two million, two hundred fifty-one thousand, two hundred thirteen".