99027781 has 2 divisors, whose sum is σ = 99027782. Its totient is φ = 99027780.

The previous prime is 99027769. The next prime is 99027821. The reversal of 99027781 is 18772099.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99002500 + 25281 = 9950^2 + 159^2 .

It is an emirp because it is prime and its reverse (18772099) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99027781 - 2⁵ = 99027749 is a prime.

It is a super-2 number, since 2×99027781² = 19613002819567922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99027701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49513890 + 49513891.

It is an arithmetic number, because the mean of its divisors is an integer number (49513891).

Almost surely, 2^99027781 is an apocalyptic number.

It is an amenable number.

99027781 is a deficient number, since it is larger than the sum of its proper divisors (1).

99027781 is an equidigital number, since it uses as much as digits as its factorization.

99027781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 63504, while the sum is 43.

The square root of 99027781 is about 9951.2703209188. The cubic root of 99027781 is about 462.6497684915.

The spelling of 99027781 in words is "ninety-nine million, twenty-seven thousand, seven hundred eighty-one".