72969137 has 2 divisors, whose sum is σ = 72969138. Its totient is φ = 72969136.

The previous prime is 72969107. The next prime is 72969161. The reversal of 72969137 is 73196927.

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., 46022656 + 26946481 = 6784^2 + 5191^2 .

It is an emirp because it is prime and its reverse (73196927) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72969137 - 2²⁰ = 71920561 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (72969107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36484568 + 36484569.

It is an arithmetic number, because the mean of its divisors is an integer number (36484569).

Almost surely, 2^72969137 is an apocalyptic number.

It is an amenable number.

72969137 is a deficient number, since it is larger than the sum of its proper divisors (1).

72969137 is an equidigital number, since it uses as much as digits as its factorization.

72969137 is an evil number, because the sum of its binary digits is even.

The product of its digits is 142884, while the sum is 44.

The square root of 72969137 is about 8542.1974339159. The cubic root of 72969137 is about 417.8750131872.

The spelling of 72969137 in words is "seventy-two million, nine hundred sixty-nine thousand, one hundred thirty-seven".