81158653 has 2 divisors, whose sum is σ = 81158654. Its totient is φ = 81158652.

The previous prime is 81158647. The next prime is 81158659. The reversal of 81158653 is 35685118.

It is a balanced prime because it is at equal distance from previous prime (81158647) and next prime (81158659).

It can be written as a sum of positive squares in only one way, i.e., 75116889 + 6041764 = 8667^2 + 2458^2 .

It is a cyclic number.

It is not a de Polignac number, because 81158653 - 2⁵ = 81158621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81158659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40579326 + 40579327.

It is an arithmetic number, because the mean of its divisors is an integer number (40579327).

Almost surely, 2^81158653 is an apocalyptic number.

It is an amenable number.

81158653 is a deficient number, since it is larger than the sum of its proper divisors (1).

81158653 is an equidigital number, since it uses as much as digits as its factorization.

81158653 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28800, while the sum is 37.

The square root of 81158653 is about 9008.8097438008. The cubic root of 81158653 is about 432.9571772530.

The spelling of 81158653 in words is "eighty-one million, one hundred fifty-eight thousand, six hundred fifty-three".