81069453 has 6 divisors (see below), whose sum is σ = 117100334. Its totient is φ = 54046296.

The previous prime is 81069451. The next prime is 81069463. The reversal of 81069453 is 35496018.

It can be written as a sum of positive squares in only one way, i.e., 80676324 + 393129 = 8982^2 + 627^2 .

It is not a de Polignac number, because 81069453 - 2¹ = 81069451 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 (81069451) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4503850 + ... + 4503867.

Almost surely, 2^81069453 is an apocalyptic number.

It is an amenable number.

81069453 is a deficient number, since it is larger than the sum of its proper divisors (36030881).

81069453 is a wasteful number, since it uses less digits than its factorization.

81069453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9007723 (or 9007720 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 81069453 is about 9003.8576732421. The cubic root of 81069453 is about 432.7985006519.

The spelling of 81069453 in words is "eighty-one million, sixty-nine thousand, four hundred fifty-three".