83891623 has 2 divisors, whose sum is σ = 83891624. Its totient is φ = 83891622.

The previous prime is 83891597. The next prime is 83891641. The reversal of 83891623 is 32619838.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 83891623 - 2⁹ = 83891111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (83892623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41945811 + 41945812.

It is an arithmetic number, because the mean of its divisors is an integer number (41945812).

Almost surely, 2^83891623 is an apocalyptic number.

83891623 is a deficient number, since it is larger than the sum of its proper divisors (1).

83891623 is an equidigital number, since it uses as much as digits as its factorization.

83891623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 40.

The square root of 83891623 is about 9159.2370315436. The cubic root of 83891623 is about 437.7634840606.

The spelling of 83891623 in words is "eighty-three million, eight hundred ninety-one thousand, six hundred twenty-three".