81049400143 has 2 divisors, whose sum is σ = 81049400144. Its totient is φ = 81049400142.

The previous prime is 81049400123. The next prime is 81049400161. The reversal of 81049400143 is 34100494018.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81049400143 - 2⁵ = 81049400111 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81049400099 and 81049400108.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81049400123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40524700071 + 40524700072.

It is an arithmetic number, because the mean of its divisors is an integer number (40524700072).

Almost surely, 2^81049400143 is an apocalyptic number.

81049400143 is a deficient number, since it is larger than the sum of its proper divisors (1).

81049400143 is an equidigital number, since it uses as much as digits as its factorization.

81049400143 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 34.

The spelling of 81049400143 in words is "eighty-one billion, forty-nine million, four hundred thousand, one hundred forty-three".