81542753 has 2 divisors, whose sum is σ = 81542754. Its totient is φ = 81542752.

The previous prime is 81542711. The next prime is 81542767. The reversal of 81542753 is 35724518.

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., 75916369 + 5626384 = 8713^2 + 2372^2 .

It is a cyclic number.

It is not a de Polignac number, because 81542753 - 2⁶ = 81542689 is a prime.

It is not a weakly prime, because it can be changed into another prime (81541753) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40771376 + 40771377.

It is an arithmetic number, because the mean of its divisors is an integer number (40771377).

Almost surely, 2^81542753 is an apocalyptic number.

It is an amenable number.

81542753 is a deficient number, since it is larger than the sum of its proper divisors (1).

81542753 is an equidigital number, since it uses as much as digits as its factorization.

81542753 is an evil number, because the sum of its binary digits is even.

The product of its digits is 33600, while the sum is 35.

The square root of 81542753 is about 9030.1026018534. The cubic root of 81542753 is about 433.6391221656.

The spelling of 81542753 in words is "eighty-one million, five hundred forty-two thousand, seven hundred fifty-three".