81902167 has 2 divisors, whose sum is σ = 81902168. Its totient is φ = 81902166.

The previous prime is 81902147. The next prime is 81902239. The reversal of 81902167 is 76120918.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81902167 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81902147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40951083 + 40951084.

It is an arithmetic number, because the mean of its divisors is an integer number (40951084).

Almost surely, 2^81902167 is an apocalyptic number.

81902167 is a deficient number, since it is larger than the sum of its proper divisors (1).

81902167 is an equidigital number, since it uses as much as digits as its factorization.

81902167 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 81902167 is about 9049.9816021912. The cubic root of 81902167 is about 434.2753019089.

The spelling of 81902167 in words is "eighty-one million, nine hundred two thousand, one hundred sixty-seven".