72970451 has 2 divisors, whose sum is σ = 72970452. Its totient is φ = 72970450.

The previous prime is 72970439. The next prime is 72970501. The reversal of 72970451 is 15407927.

It is a weak prime.

It is an emirp because it is prime and its reverse (15407927) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72970451 is a prime.

It is not a weakly prime, because it can be changed into another prime (72970951) 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, 36485225 + 36485226.

It is an arithmetic number, because the mean of its divisors is an integer number (36485226).

Almost surely, 2^72970451 is an apocalyptic number.

72970451 is a deficient number, since it is larger than the sum of its proper divisors (1).

72970451 is an equidigital number, since it uses as much as digits as its factorization.

72970451 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17640, while the sum is 35.

The square root of 72970451 is about 8542.2743458636. The cubic root of 72970451 is about 417.8775214826.

The spelling of 72970451 in words is "seventy-two million, nine hundred seventy thousand, four hundred fifty-one".