81854963 has 2 divisors, whose sum is σ = 81854964. Its totient is φ = 81854962.

The previous prime is 81854939. The next prime is 81854987. The reversal of 81854963 is 36945818.

It is a balanced prime because it is at equal distance from previous prime (81854939) and next prime (81854987).

It is a cyclic number.

It is not a de Polignac number, because 81854963 - 2¹⁰ = 81853939 is a prime.

It is a Sophie Germain prime.

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

It is not a weakly prime, because it can be changed into another prime (81884963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40927481 + 40927482.

It is an arithmetic number, because the mean of its divisors is an integer number (40927482).

Almost surely, 2^81854963 is an apocalyptic number.

81854963 is a deficient number, since it is larger than the sum of its proper divisors (1).

81854963 is an equidigital number, since it uses as much as digits as its factorization.

81854963 is an evil number, because the sum of its binary digits is even.

The product of its digits is 207360, while the sum is 44.

The square root of 81854963 is about 9047.3732652080. The cubic root of 81854963 is about 434.1918549069.

The spelling of 81854963 in words is "eighty-one million, eight hundred fifty-four thousand, nine hundred sixty-three".