81408002141 has 2 divisors, whose sum is σ = 81408002142. Its totient is φ = 81408002140.

The previous prime is 81408002131. The next prime is 81408002147. The reversal of 81408002141 is 14120080418.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49649198041 + 31758804100 = 222821^2 + 178210^2 .

It is a cyclic number.

It is not a de Polignac number, because 81408002141 - 2³⁰ = 80334260317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81408002147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40704001070 + 40704001071.

It is an arithmetic number, because the mean of its divisors is an integer number (40704001071).

Almost surely, 2^81408002141 is an apocalyptic number.

It is an amenable number.

81408002141 is a deficient number, since it is larger than the sum of its proper divisors (1).

81408002141 is an equidigital number, since it uses as much as digits as its factorization.

81408002141 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2048, while the sum is 29.

Adding to 81408002141 its reverse (14120080418), we get a palindrome (95528082559).

The spelling of 81408002141 in words is "eighty-one billion, four hundred eight million, two thousand, one hundred forty-one".