83069991 has 12 divisors (see below), whose sum is σ = 120137368. Its totient is φ = 55311984.

The previous prime is 83069981. The next prime is 83069993. The reversal of 83069991 is 19996038.

It is not a de Polignac number, because 83069991 - 2¹⁵ = 83037223 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 (83069993) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2721 + ... + 13173.

Almost surely, 2^83069991 is an apocalyptic number.

83069991 is a deficient number, since it is larger than the sum of its proper divisors (37067377).

83069991 is a wasteful number, since it uses less digits than its factorization.

83069991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11342 (or 11339 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 45.

The square root of 83069991 is about 9114.2740248470. The cubic root of 83069991 is about 436.3296454229.

The spelling of 83069991 in words is "eighty-three million, sixty-nine thousand, nine hundred ninety-one".