99647437 has 2 divisors, whose sum is σ = 99647438. Its totient is φ = 99647436.

The previous prime is 99647411. The next prime is 99647461. The reversal of 99647437 is 73474699.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 94692361 + 4955076 = 9731^2 + 2226^2 .

It is an emirp because it is prime and its reverse (73474699) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99647437 - 2⁷ = 99647309 is a prime.

It is a super-2 number, since 2×99647437² = 19859223401337938, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99647137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49823718 + 49823719.

It is an arithmetic number, because the mean of its divisors is an integer number (49823719).

Almost surely, 2^99647437 is an apocalyptic number.

It is an amenable number.

99647437 is a deficient number, since it is larger than the sum of its proper divisors (1).

99647437 is an equidigital number, since it uses as much as digits as its factorization.

99647437 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1143072, while the sum is 49.

The square root of 99647437 is about 9982.3562849660. The cubic root of 99647437 is about 463.6127568829.

The spelling of 99647437 in words is "ninety-nine million, six hundred forty-seven thousand, four hundred thirty-seven".