80521371 has 80 divisors (see below), whose sum is σ = 146361600. Its totient is φ = 43146432.

The previous prime is 80521369. The next prime is 80521391. The reversal of 80521371 is 17312508.

It is not a de Polignac number, because 80521371 - 2¹ = 80521369 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80521351) 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 79 ways as a sum of consecutive naturals, for example, 970096 + ... + 970178.

It is an arithmetic number, because the mean of its divisors is an integer number (1829520).

Almost surely, 2^80521371 is an apocalyptic number.

80521371 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

80521371 is a deficient number, since it is larger than the sum of its proper divisors (65840229).

80521371 is a wasteful number, since it uses less digits than its factorization.

80521371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190 (or 181 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 80521371 is about 8973.3701026983. The cubic root of 80521371 is about 431.8209616891.

Adding to 80521371 its reverse (17312508), we get a palindrome (97833879).

The spelling of 80521371 in words is "eighty million, five hundred twenty-one thousand, three hundred seventy-one".