1005554789 has 2 divisors, whose sum is σ = 1005554790. Its totient is φ = 1005554788.

The previous prime is 1005554723. The next prime is 1005554813. The reversal of 1005554789 is 9874555001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 736036900 + 269517889 = 27130^2 + 16417^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1005554789 is a prime.

It is a super-2 number, since 2×1005554789² = 2022280867361669042, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1005554489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 502777394 + 502777395.

It is an arithmetic number, because the mean of its divisors is an integer number (502777395).

Almost surely, 2^1005554789 is an apocalyptic number.

It is an amenable number.

1005554789 is a deficient number, since it is larger than the sum of its proper divisors (1).

1005554789 is an equidigital number, since it uses as much as digits as its factorization.

1005554789 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 252000, while the sum is 44.

The square root of 1005554789 is about 31710.4838972855. The cubic root of 1005554789 is about 1001.8481784654.

The spelling of 1005554789 in words is "one billion, five million, five hundred fifty-four thousand, seven hundred eighty-nine".