81896741 has 2 divisors, whose sum is σ = 81896742. Its totient is φ = 81896740.

The previous prime is 81896687. The next prime is 81896743. The reversal of 81896741 is 14769818.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61230625 + 20666116 = 7825^2 + 4546^2 .

It is a cyclic number.

It is not a de Polignac number, because 81896741 - 2⁶ = 81896677 is a prime.

Together with 81896743, it forms a pair of twin primes.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 81896692 and 81896701.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81896743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40948370 + 40948371.

It is an arithmetic number, because the mean of its divisors is an integer number (40948371).

Almost surely, 2^81896741 is an apocalyptic number.

It is an amenable number.

81896741 is a deficient number, since it is larger than the sum of its proper divisors (1).

81896741 is an equidigital number, since it uses as much as digits as its factorization.

81896741 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 44.

The square root of 81896741 is about 9049.6818176110. The cubic root of 81896741 is about 434.2657114837.

The spelling of 81896741 in words is "eighty-one million, eight hundred ninety-six thousand, seven hundred forty-one".