72165451 has 2 divisors, whose sum is σ = 72165452. Its totient is φ = 72165450.

The previous prime is 72165419. The next prime is 72165463. The reversal of 72165451 is 15456127.

It is a strong prime.

It is an emirp because it is prime and its reverse (15456127) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72165451 - 2⁵ = 72165419 is a prime.

It is not a weakly prime, because it can be changed into another prime (72165491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36082725 + 36082726.

It is an arithmetic number, because the mean of its divisors is an integer number (36082726).

Almost surely, 2^72165451 is an apocalyptic number.

72165451 is a deficient number, since it is larger than the sum of its proper divisors (1).

72165451 is an equidigital number, since it uses as much as digits as its factorization.

72165451 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8400, while the sum is 31.

The square root of 72165451 is about 8495.0250735357. The cubic root of 72165451 is about 416.3351800476.

The spelling of 72165451 in words is "seventy-two million, one hundred sixty-five thousand, four hundred fifty-one".