81724607 has 2 divisors, whose sum is σ = 81724608. Its totient is φ = 81724606.

The previous prime is 81724597. The next prime is 81724619. The reversal of 81724607 is 70642718.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81724607 - 2⁸ = 81724351 is a prime.

It is a super-2 number, since 2×81724607² = 13357822778608898, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81724637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40862303 + 40862304.

It is an arithmetic number, because the mean of its divisors is an integer number (40862304).

Almost surely, 2^81724607 is an apocalyptic number.

81724607 is a deficient number, since it is larger than the sum of its proper divisors (1).

81724607 is an equidigital number, since it uses as much as digits as its factorization.

81724607 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 81724607 is about 9040.1663148418. The cubic root of 81724607 is about 433.9612454511.

The spelling of 81724607 in words is "eighty-one million, seven hundred twenty-four thousand, six hundred seven".