999281749 has 2 divisors, whose sum is σ = 999281750. Its totient is φ = 999281748.

The previous prime is 999281729. The next prime is 999281791. The reversal of 999281749 is 947182999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 982822500 + 16459249 = 31350^2 + 4057^2 .

It is a cyclic number.

It is not a de Polignac number, because 999281749 - 2²⁵ = 965727317 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 999281693 and 999281702.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999281719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499640874 + 499640875.

It is an arithmetic number, because the mean of its divisors is an integer number (499640875).

Almost surely, 2^999281749 is an apocalyptic number.

It is an amenable number.

999281749 is a deficient number, since it is larger than the sum of its proper divisors (1).

999281749 is an equidigital number, since it uses as much as digits as its factorization.

999281749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2939328, while the sum is 58.

The square root of 999281749 is about 31611.4180162801. The cubic root of 999281749 is about 999.7605256566.

The spelling of 999281749 in words is "nine hundred ninety-nine million, two hundred eighty-one thousand, seven hundred forty-nine".