81053452 has 12 divisors (see below), whose sum is σ = 145142536. Its totient is φ = 39584160.

The previous prime is 81053407. The next prime is 81053459. The reversal of 81053452 is 25435018.

It is a super-2 number, since 2×81053452² = 13139324162232608, which contains 22 as substring.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 81053452.

It is not an unprimeable number, because it can be changed into a prime (81053459) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 235449 + ... + 235792.

Almost surely, 2^81053452 is an apocalyptic number.

It is an amenable number.

81053452 is a deficient number, since it is larger than the sum of its proper divisors (64089084).

81053452 is a wasteful number, since it uses less digits than its factorization.

81053452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471288 (or 471286 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 81053452 is about 9002.9690658138. The cubic root of 81053452 is about 432.7700243919.

The spelling of 81053452 in words is "eighty-one million, fifty-three thousand, four hundred fifty-two".