81970241 has 2 divisors, whose sum is σ = 81970242. Its totient is φ = 81970240.

The previous prime is 81970223. The next prime is 81970247. The reversal of 81970241 is 14207918.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62078641 + 19891600 = 7879^2 + 4460^2 .

It is a cyclic number.

It is not a de Polignac number, because 81970241 - 2¹⁴ = 81953857 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 81970198 and 81970207.

It is not a weakly prime, because it can be changed into another prime (81970247) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40985120 + 40985121.

It is an arithmetic number, because the mean of its divisors is an integer number (40985121).

Almost surely, 2^81970241 is an apocalyptic number.

It is an amenable number.

81970241 is a deficient number, since it is larger than the sum of its proper divisors (1).

81970241 is an equidigital number, since it uses as much as digits as its factorization.

81970241 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 81970241 is about 9053.7418231359. The cubic root of 81970241 is about 434.3955863542.

The spelling of 81970241 in words is "eighty-one million, nine hundred seventy thousand, two hundred forty-one".