83661493 has 6 divisors (see below), whose sum is σ = 84933366. Its totient is φ = 82408392.

The previous prime is 83661407. The next prime is 83661497. The reversal of 83661493 is 39416638.

It can be written as a sum of positive squares in only one way, i.e., 43996689 + 39664804 = 6633^2 + 6298^2 .

It is not a de Polignac number, because 83661493 - 2²¹ = 81564341 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 (83661497) 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, 4830 + ... + 13807.

It is an arithmetic number, because the mean of its divisors is an integer number (14155561).

Almost surely, 2^83661493 is an apocalyptic number.

It is an amenable number.

83661493 is a deficient number, since it is larger than the sum of its proper divisors (1271873).

83661493 is an equidigital number, since it uses as much as digits as its factorization.

83661493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18771 (or 18704 counting only the distinct ones).

The product of its digits is 93312, while the sum is 40.

The square root of 83661493 is about 9146.6656766277. The cubic root of 83661493 is about 437.3628291601.

The spelling of 83661493 in words is "eighty-three million, six hundred sixty-one thousand, four hundred ninety-three".