81976983 has 8 divisors (see below), whose sum is σ = 119239296. Its totient is φ = 49683000.

The previous prime is 81976981. The next prime is 81977003. The reversal of 81976983 is 38967918.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81976983 - 2¹ = 81976981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81976981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1242043 + ... + 1242108.

It is an arithmetic number, because the mean of its divisors is an integer number (14904912).

Almost surely, 2^81976983 is an apocalyptic number.

81976983 is a deficient number, since it is larger than the sum of its proper divisors (37262313).

81976983 is a wasteful number, since it uses less digits than its factorization.

81976983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2484165.

The product of its digits is 653184, while the sum is 51.

The square root of 81976983 is about 9054.1141477231. The cubic root of 81976983 is about 434.4074956142.

The spelling of 81976983 in words is "eighty-one million, nine hundred seventy-six thousand, nine hundred eighty-three".