83120391 has 16 divisors (see below), whose sum is σ = 123417600. Its totient is φ = 55289304.

The previous prime is 83120371. The next prime is 83120423. The reversal of 83120391 is 19302138.

It is not a de Polignac number, because 83120391 - 2⁷ = 83120263 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83120311) 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, 9720 + ... + 16146.

It is an arithmetic number, because the mean of its divisors is an integer number (7713600).

Almost surely, 2^83120391 is an apocalyptic number.

83120391 is a deficient number, since it is larger than the sum of its proper divisors (40297209).

83120391 is a wasteful number, since it uses less digits than its factorization.

83120391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6915 (or 6909 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 83120391 is about 9117.0384994251. The cubic root of 83120391 is about 436.4178704964.

The spelling of 83120391 in words is "eighty-three million, one hundred twenty thousand, three hundred ninety-one".