81484551097 has 2 divisors, whose sum is σ = 81484551098. Its totient is φ = 81484551096.

The previous prime is 81484551019. The next prime is 81484551121. The reversal of 81484551097 is 79015548418.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73016686656 + 8467864441 = 270216^2 + 92021^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81484551097 is a prime.

It is not a weakly prime, because it can be changed into another prime (81484551007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40742275548 + 40742275549.

It is an arithmetic number, because the mean of its divisors is an integer number (40742275549).

Almost surely, 2^81484551097 is an apocalyptic number.

It is an amenable number.

81484551097 is a deficient number, since it is larger than the sum of its proper divisors (1).

81484551097 is an equidigital number, since it uses as much as digits as its factorization.

81484551097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1612800, while the sum is 52.

The spelling of 81484551097 in words is "eighty-one billion, four hundred eighty-four million, five hundred fifty-one thousand, ninety-seven".