72103637 has 2 divisors, whose sum is σ = 72103638. Its totient is φ = 72103636.

The previous prime is 72103631. The next prime is 72103667. The reversal of 72103637 is 73630127.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63377521 + 8726116 = 7961^2 + 2954^2 .

It is an emirp because it is prime and its reverse (73630127) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72103637 - 2⁶ = 72103573 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72103631) 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, 36051818 + 36051819.

It is an arithmetic number, because the mean of its divisors is an integer number (36051819).

Almost surely, 2^72103637 is an apocalyptic number.

It is an amenable number.

72103637 is a deficient number, since it is larger than the sum of its proper divisors (1).

72103637 is an equidigital number, since it uses as much as digits as its factorization.

72103637 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5292, while the sum is 29.

The square root of 72103637 is about 8491.3860470479. The cubic root of 72103637 is about 416.2162741450.

The spelling of 72103637 in words is "seventy-two million, one hundred three thousand, six hundred thirty-seven".