99003781 has 2 divisors, whose sum is σ = 99003782. Its totient is φ = 99003780.

The previous prime is 99003769. The next prime is 99003787. The reversal of 99003781 is 18730099.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 95374756 + 3629025 = 9766^2 + 1905^2 .

It is a cyclic number.

It is not a de Polignac number, because 99003781 - 2¹⁵ = 98971013 is a prime.

It is a super-2 number, since 2×99003781² = 19603497304591922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 99003781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99003787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49501890 + 49501891.

It is an arithmetic number, because the mean of its divisors is an integer number (49501891).

Almost surely, 2^99003781 is an apocalyptic number.

It is an amenable number.

99003781 is a deficient number, since it is larger than the sum of its proper divisors (1).

99003781 is an equidigital number, since it uses as much as digits as its factorization.

99003781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 99003781 is about 9950.0643716511. The cubic root of 99003781 is about 462.6123901200.

The spelling of 99003781 in words is "ninety-nine million, three thousand, seven hundred eighty-one".