81472747 has 2 divisors, whose sum is σ = 81472748. Its totient is φ = 81472746.

The previous prime is 81472723. The next prime is 81472751. The reversal of 81472747 is 74727418.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81472747 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is not a weakly prime, because it can be changed into another prime (81472777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40736373 + 40736374.

It is an arithmetic number, because the mean of its divisors is an integer number (40736374).

Almost surely, 2^81472747 is an apocalyptic number.

81472747 is a deficient number, since it is larger than the sum of its proper divisors (1).

81472747 is an equidigital number, since it uses as much as digits as its factorization.

81472747 is an evil number, because the sum of its binary digits is even.

The product of its digits is 87808, while the sum is 40.

The square root of 81472747 is about 9026.2255123612. The cubic root of 81472747 is about 433.5149908322.

The spelling of 81472747 in words is "eighty-one million, four hundred seventy-two thousand, seven hundred forty-seven".