81956083 has 6 divisors (see below), whose sum is σ = 90084092. Its totient is φ = 74505420.

The previous prime is 81956057. The next prime is 81956111. The reversal of 81956083 is 38065918.

It is a happy number.

It is not a de Polignac number, because 81956083 - 2⁵ = 81956051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81956053) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 338541 + ... + 338782.

Almost surely, 2^81956083 is an apocalyptic number.

81956083 is a deficient number, since it is larger than the sum of its proper divisors (8128009).

81956083 is a wasteful number, since it uses less digits than its factorization.

81956083 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 677345 (or 677334 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 81956083 is about 9052.9599027059. The cubic root of 81956083 is about 434.3705751356.

The spelling of 81956083 in words is "eighty-one million, nine hundred fifty-six thousand, eighty-three".