81963097 has 2 divisors, whose sum is σ = 81963098. Its totient is φ = 81963096.

The previous prime is 81963071. The next prime is 81963113. The reversal of 81963097 is 79036918.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79495056 + 2468041 = 8916^2 + 1571^2 .

It is a cyclic number.

It is not a de Polignac number, because 81963097 - 2²³ = 73574489 is a prime.

It is not a weakly prime, because it can be changed into another prime (81963067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40981548 + 40981549.

It is an arithmetic number, because the mean of its divisors is an integer number (40981549).

Almost surely, 2^81963097 is an apocalyptic number.

It is an amenable number.

81963097 is a deficient number, since it is larger than the sum of its proper divisors (1).

81963097 is an equidigital number, since it uses as much as digits as its factorization.

81963097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 81963097 is about 9053.3472815307. The cubic root of 81963097 is about 434.3829662773.

The spelling of 81963097 in words is "eighty-one million, nine hundred sixty-three thousand, ninety-seven".