81980353 has 16 divisors (see below), whose sum is σ = 101207680. Its totient is φ = 64665216.

The previous prime is 81980333. The next prime is 81980377. The reversal of 81980353 is 35308918.

It is a de Polignac number, because none of the positive numbers 2^k-81980353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81980333) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33301 + ... + 35677.

It is an arithmetic number, because the mean of its divisors is an integer number (6325480).

Almost surely, 2^81980353 is an apocalyptic number.

It is an amenable number.

81980353 is a deficient number, since it is larger than the sum of its proper divisors (19227327).

81980353 is a wasteful number, since it uses less digits than its factorization.

81980353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2776.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 81980353 is about 9054.3002490529. The cubic root of 81980353 is about 434.4134482331.

The spelling of 81980353 in words is "eighty-one million, nine hundred eighty thousand, three hundred fifty-three".