80981621 has 4 divisors (see below), whose sum is σ = 92550432. Its totient is φ = 69412812.

The previous prime is 80981617. The next prime is 80981633. The reversal of 80981621 is 12618908.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 80981621 - 2² = 80981617 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80981651) 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, 5784395 + ... + 5784408.

It is an arithmetic number, because the mean of its divisors is an integer number (23137608).

Almost surely, 2^80981621 is an apocalyptic number.

It is an amenable number.

80981621 is a deficient number, since it is larger than the sum of its proper divisors (11568811).

80981621 is a wasteful number, since it uses less digits than its factorization.

80981621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11568810.

The product of its (nonzero) digits is 6912, while the sum is 35.

The square root of 80981621 is about 8998.9788865182. The cubic root of 80981621 is about 432.6421437960.

The spelling of 80981621 in words is "eighty million, nine hundred eighty-one thousand, six hundred twenty-one".