81670367 has 2 divisors, whose sum is σ = 81670368. Its totient is φ = 81670366.

The previous prime is 81670333. The next prime is 81670441. The reversal of 81670367 is 76307618.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81670367 is a prime.

It is a Chen prime.

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

It is a self number, because there is not a number n which added to its sum of digits gives 81670367.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81670307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40835183 + 40835184.

It is an arithmetic number, because the mean of its divisors is an integer number (40835184).

Almost surely, 2^81670367 is an apocalyptic number.

81670367 is a deficient number, since it is larger than the sum of its proper divisors (1).

81670367 is an equidigital number, since it uses as much as digits as its factorization.

81670367 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 81670367 is about 9037.1658721084. The cubic root of 81670367 is about 433.8652186114.

The spelling of 81670367 in words is "eighty-one million, six hundred seventy thousand, three hundred sixty-seven".