83961289 has 4 divisors (see below), whose sum is σ = 84258256. Its totient is φ = 83664324.

The previous prime is 83961287. The next prime is 83961313. The reversal of 83961289 is 98216938.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 83961289 - 2¹ = 83961287 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (83961287) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 148059 + ... + 148624.

It is an arithmetic number, because the mean of its divisors is an integer number (21064564).

Almost surely, 2^83961289 is an apocalyptic number.

It is an amenable number.

83961289 is a deficient number, since it is larger than the sum of its proper divisors (296967).

83961289 is a wasteful number, since it uses less digits than its factorization.

83961289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296966.

The product of its digits is 186624, while the sum is 46.

The square root of 83961289 is about 9163.0392883584. The cubic root of 83961289 is about 437.8846276335.

It can be divided in two parts, 839 and 61289, that added together give a triangular number (62128 = T₃₅₂).

The spelling of 83961289 in words is "eighty-three million, nine hundred sixty-one thousand, two hundred eighty-nine".