83091861 has 6 divisors (see below), whose sum is σ = 120021590. Its totient is φ = 55394568.

The previous prime is 83091839. The next prime is 83091887. The reversal of 83091861 is 16819038.

It can be written as a sum of positive squares in only one way, i.e., 82628100 + 463761 = 9090^2 + 681^2 .

It is not a de Polignac number, because 83091861 - 2⁵ = 83091829 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 (83091661) 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, 4616206 + ... + 4616223.

Almost surely, 2^83091861 is an apocalyptic number.

It is an amenable number.

83091861 is a deficient number, since it is larger than the sum of its proper divisors (36929729).

83091861 is a wasteful number, since it uses less digits than its factorization.

83091861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9232435 (or 9232432 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 83091861 is about 9115.4737123202. The cubic root of 83091861 is about 436.3679331845.

The spelling of 83091861 in words is "eighty-three million, ninety-one thousand, eight hundred sixty-one".