72951289 has 2 divisors, whose sum is σ = 72951290. Its totient is φ = 72951288.

The previous prime is 72951287. The next prime is 72951311. The reversal of 72951289 is 98215927.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72114064 + 837225 = 8492^2 + 915^2 .

It is an emirp because it is prime and its reverse (98215927) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72951289 - 2¹ = 72951287 is a prime.

Together with 72951287, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (72951283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36475644 + 36475645.

It is an arithmetic number, because the mean of its divisors is an integer number (36475645).

Almost surely, 2^72951289 is an apocalyptic number.

It is an amenable number.

72951289 is a deficient number, since it is larger than the sum of its proper divisors (1).

72951289 is an equidigital number, since it uses as much as digits as its factorization.

72951289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 43.

The square root of 72951289 is about 8541.1526739662. The cubic root of 72951289 is about 417.8409401452.

The spelling of 72951289 in words is "seventy-two million, nine hundred fifty-one thousand, two hundred eighty-nine".