80957521 has 4 divisors (see below), whose sum is σ = 81473332. Its totient is φ = 80441712.

The previous prime is 80957509. The next prime is 80957533. The reversal of 80957521 is 12575908.

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

It is an interprime number because it is at equal distance from previous prime (80957509) and next prime (80957533).

It can be written as a sum of positive squares in 2 ways, for example, as 12250000 + 68707521 = 3500^2 + 8289^2 .

It is a cyclic number.

It is not a de Polignac number, because 80957521 - 2¹⁹ = 80433233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80957551) 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 in 3 ways as a sum of consecutive naturals, for example, 257670 + ... + 257983.

It is an arithmetic number, because the mean of its divisors is an integer number (20368333).

Almost surely, 2^80957521 is an apocalyptic number.

It is an amenable number.

80957521 is a deficient number, since it is larger than the sum of its proper divisors (515811).

80957521 is a wasteful number, since it uses less digits than its factorization.

80957521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 515810.

The product of its (nonzero) digits is 25200, while the sum is 37.

The square root of 80957521 is about 8997.6397460667. The cubic root of 80957521 is about 432.5992216694.

The spelling of 80957521 in words is "eighty million, nine hundred fifty-seven thousand, five hundred twenty-one".