81750953 has 2 divisors, whose sum is σ = 81750954. Its totient is φ = 81750952.

The previous prime is 81750941. The next prime is 81750959. The reversal of 81750953 is 35905718.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60341824 + 21409129 = 7768^2 + 4627^2 .

It is a cyclic number.

It is not a de Polignac number, because 81750953 - 2¹² = 81746857 is a prime.

It is not a weakly prime, because it can be changed into another prime (81750959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40875476 + 40875477.

It is an arithmetic number, because the mean of its divisors is an integer number (40875477).

Almost surely, 2^81750953 is an apocalyptic number.

It is an amenable number.

81750953 is a deficient number, since it is larger than the sum of its proper divisors (1).

81750953 is an equidigital number, since it uses as much as digits as its factorization.

81750953 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 37800, while the sum is 38.

The square root of 81750953 is about 9041.6233608794. The cubic root of 81750953 is about 434.0078732459.

The spelling of 81750953 in words is "eighty-one million, seven hundred fifty thousand, nine hundred fifty-three".