1008726989 has 2 divisors, whose sum is σ = 1008726990. Its totient is φ = 1008726988.

The previous prime is 1008726907. The next prime is 1008727001. The reversal of 1008726989 is 9896278001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 681732100 + 326994889 = 26110^2 + 18083^2 .

It is a cyclic number.

It is not a de Polignac number, because 1008726989 - 2¹⁶ = 1008661453 is a prime.

It is a super-2 number, since 2×1008726989² = 2035060276674012242, 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 (1008729989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 504363494 + 504363495.

It is an arithmetic number, because the mean of its divisors is an integer number (504363495).

Almost surely, 2^1008726989 is an apocalyptic number.

It is an amenable number.

1008726989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1008726989 is an equidigital number, since it uses as much as digits as its factorization.

1008726989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 435456, while the sum is 50.

The square root of 1008726989 is about 31760.4626698038. The cubic root of 1008726989 is about 1002.9005748643.

The spelling of 1008726989 in words is "one billion, eight million, seven hundred twenty-six thousand, nine hundred eighty-nine".