81414253 has 4 divisors (see below), whose sum is σ = 81432508. Its totient is φ = 81396000.

The previous prime is 81414247. The next prime is 81414271. The reversal of 81414253 is 35241418.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 60419529 + 20994724 = 7773^2 + 4582^2 .

It is a cyclic number.

It is not a de Polignac number, because 81414253 - 2²⁵ = 47859821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81415253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2503 + ... + 13003.

It is an arithmetic number, because the mean of its divisors is an integer number (20358127).

Almost surely, 2^81414253 is an apocalyptic number.

It is an amenable number.

81414253 is a deficient number, since it is larger than the sum of its proper divisors (18255).

81414253 is a wasteful number, since it uses less digits than its factorization.

81414253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18254.

The product of its digits is 3840, while the sum is 28.

The square root of 81414253 is about 9022.9847057390. The cubic root of 81414253 is about 433.4112174933.

The spelling of 81414253 in words is "eighty-one million, four hundred fourteen thousand, two hundred fifty-three".