99780137 has 2 divisors, whose sum is σ = 99780138. Its totient is φ = 99780136.

The previous prime is 99780091. The next prime is 99780143. The reversal of 99780137 is 73108799.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99780121 + 16 = 9989^2 + 4^2 .

It is an emirp because it is prime and its reverse (73108799) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99780137 - 2⁸ = 99779881 is a prime.

It is a Chen prime.

It is equal to p_5749496 and since 99780137 and 5749496 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (99780337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49890068 + 49890069.

It is an arithmetic number, because the mean of its divisors is an integer number (49890069).

Almost surely, 2^99780137 is an apocalyptic number.

It is an amenable number.

99780137 is a deficient number, since it is larger than the sum of its proper divisors (1).

99780137 is an equidigital number, since it uses as much as digits as its factorization.

99780137 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 95256, while the sum is 44.

The square root of 99780137 is about 9989.0008008809. Note that the first 3 decimals coincide. The cubic root of 99780137 is about 463.8184625375.

The spelling of 99780137 in words is "ninety-nine million, seven hundred eighty thousand, one hundred thirty-seven".