81560452 has 6 divisors (see below), whose sum is σ = 142730798. Its totient is φ = 40780224.

The previous prime is 81560443. The next prime is 81560459. The reversal of 81560452 is 25406518.

It can be written as a sum of positive squares in only one way, i.e., 65028096 + 16532356 = 8064^2 + 4066^2 .

It is not an unprimeable number, because it can be changed into a prime (81560459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10195053 + ... + 10195060.

Almost surely, 2^81560452 is an apocalyptic number.

It is an amenable number.

81560452 is a deficient number, since it is larger than the sum of its proper divisors (61170346).

81560452 is a wasteful number, since it uses less digits than its factorization.

81560452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20390117 (or 20390115 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 31.

The square root of 81560452 is about 9031.0825486206. The cubic root of 81560452 is about 433.6704939443.

The spelling of 81560452 in words is "eighty-one million, five hundred sixty thousand, four hundred fifty-two".