81201767 has 2 divisors, whose sum is σ = 81201768. Its totient is φ = 81201766.

The previous prime is 81201761. The next prime is 81201773. The reversal of 81201767 is 76710218.

It is a balanced prime because it is at equal distance from previous prime (81201761) and next prime (81201773).

It is a cyclic number.

It is not a de Polignac number, because 81201767 - 2⁸ = 81201511 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81201761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40600883 + 40600884.

It is an arithmetic number, because the mean of its divisors is an integer number (40600884).

Almost surely, 2^81201767 is an apocalyptic number.

81201767 is a deficient number, since it is larger than the sum of its proper divisors (1).

81201767 is an equidigital number, since it uses as much as digits as its factorization.

81201767 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4704, while the sum is 32.

The square root of 81201767 is about 9011.2023060189. The cubic root of 81201767 is about 433.0338304527.

The spelling of 81201767 in words is "eighty-one million, two hundred one thousand, seven hundred sixty-seven".