81541753 has 2 divisors, whose sum is σ = 81541754. Its totient is φ = 81541752.

The previous prime is 81541729. The next prime is 81541763. The reversal of 81541753 is 35714518.

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., 63154809 + 18386944 = 7947^2 + 4288^2 .

It is a cyclic number.

It is not a de Polignac number, because 81541753 - 2⁵ = 81541721 is a prime.

It is not a weakly prime, because it can be changed into another prime (81541703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40770876 + 40770877.

It is an arithmetic number, because the mean of its divisors is an integer number (40770877).

Almost surely, 2^81541753 is an apocalyptic number.

It is an amenable number.

81541753 is a deficient number, since it is larger than the sum of its proper divisors (1).

81541753 is an equidigital number, since it uses as much as digits as its factorization.

81541753 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16800, while the sum is 34.

The square root of 81541753 is about 9030.0472313272. The cubic root of 81541753 is about 433.6373495131.

The spelling of 81541753 in words is "eighty-one million, five hundred forty-one thousand, seven hundred fifty-three".