83991949 has 2 divisors, whose sum is σ = 83991950. Its totient is φ = 83991948.

The previous prime is 83991911. The next prime is 83991959. The reversal of 83991949 is 94919938.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68641225 + 15350724 = 8285^2 + 3918^2 .

It is a cyclic number.

It is not a de Polignac number, because 83991949 - 2⁹ = 83991437 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 83991896 and 83991905.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (83991959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41995974 + 41995975.

It is an arithmetic number, because the mean of its divisors is an integer number (41995975).

Almost surely, 2^83991949 is an apocalyptic number.

It is an amenable number.

83991949 is a deficient number, since it is larger than the sum of its proper divisors (1).

83991949 is an equidigital number, since it uses as much as digits as its factorization.

83991949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 629856, while the sum is 52.

The square root of 83991949 is about 9164.7121613284. The cubic root of 83991949 is about 437.9379216733.

The spelling of 83991949 in words is "eighty-three million, nine hundred ninety-one thousand, nine hundred forty-nine".