81243607 has 2 divisors, whose sum is σ = 81243608. Its totient is φ = 81243606.

The previous prime is 81243581. The next prime is 81243661. The reversal of 81243607 is 70634218.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81243607 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81243907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40621803 + 40621804.

It is an arithmetic number, because the mean of its divisors is an integer number (40621804).

Almost surely, 2^81243607 is an apocalyptic number.

81243607 is a deficient number, since it is larger than the sum of its proper divisors (1).

81243607 is an equidigital number, since it uses as much as digits as its factorization.

81243607 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 81243607 is about 9013.5235618486. The cubic root of 81243607 is about 433.1081926461.

The spelling of 81243607 in words is "eighty-one million, two hundred forty-three thousand, six hundred seven".