72202309 has 2 divisors, whose sum is σ = 72202310. Its totient is φ = 72202308.

The previous prime is 72202307. The next prime is 72202331. The reversal of 72202309 is 90320227.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67601284 + 4601025 = 8222^2 + 2145^2 .

It is an emirp because it is prime and its reverse (90320227) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72202309 - 2¹ = 72202307 is a prime.

Together with 72202307, 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 (72202303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36101154 + 36101155.

It is an arithmetic number, because the mean of its divisors is an integer number (36101155).

Almost surely, 2^72202309 is an apocalyptic number.

It is an amenable number.

72202309 is a deficient number, since it is larger than the sum of its proper divisors (1).

72202309 is an equidigital number, since it uses as much as digits as its factorization.

72202309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 72202309 is about 8497.1941839645. The cubic root of 72202309 is about 416.4060480788.

The spelling of 72202309 in words is "seventy-two million, two hundred two thousand, three hundred nine".