81754492229 has 2 divisors, whose sum is σ = 81754492230. Its totient is φ = 81754492228.

The previous prime is 81754492189. The next prime is 81754492241. The reversal of 81754492229 is 92229445718.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72894600100 + 8859892129 = 269990^2 + 94127^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81754492229 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81754492529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40877246114 + 40877246115.

It is an arithmetic number, because the mean of its divisors is an integer number (40877246115).

Almost surely, 2^81754492229 is an apocalyptic number.

It is an amenable number.

81754492229 is a deficient number, since it is larger than the sum of its proper divisors (1).

81754492229 is an equidigital number, since it uses as much as digits as its factorization.

81754492229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2903040, while the sum is 53.

The spelling of 81754492229 in words is "eighty-one billion, seven hundred fifty-four million, four hundred ninety-two thousand, two hundred twenty-nine".