72247997 has 2 divisors, whose sum is σ = 72247998. Its totient is φ = 72247996.

The previous prime is 72247993. The next prime is 72247999. The reversal of 72247997 is 79974227.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70744921 + 1503076 = 8411^2 + 1226^2 .

It is a cyclic number.

It is not a de Polignac number, because 72247997 - 2² = 72247993 is a prime.

Together with 72247999, 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 (72247993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36123998 + 36123999.

It is an arithmetic number, because the mean of its divisors is an integer number (36123999).

Almost surely, 2^72247997 is an apocalyptic number.

It is an amenable number.

72247997 is a deficient number, since it is larger than the sum of its proper divisors (1).

72247997 is an equidigital number, since it uses as much as digits as its factorization.

72247997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 444528, while the sum is 47.

The square root of 72247997 is about 8499.8821756540. The cubic root of 72247997 is about 416.4938603588.

The spelling of 72247997 in words is "seventy-two million, two hundred forty-seven thousand, nine hundred ninety-seven".