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99997897 is a prime number
BaseRepresentation
bin1011111010111…
…01100011001001
320222011102022211
411331131203021
5201044413042
613531145121
72322653026
oct575354311
9228142284
1099997897
115149a99a
12295a51a1
131794286c
14d3d054d
158ba4017
hex5f5d8c9

99997897 has 2 divisors, whose sum is σ = 99997898. Its totient is φ = 99997896.

The previous prime is 99997879. The next prime is 99997901. The reversal of 99997897 is 79879999.

Together with previous prime (99997879) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56385081 + 43612816 = 7509^2 + 6604^2 .

It is an emirp because it is prime and its reverse (79879999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99997897 - 27 = 99997769 is a prime.

It is not a weakly prime, because it can be changed into another prime (99997837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49998948 + 49998949.

It is an arithmetic number, because the mean of its divisors is an integer number (49998949).

Almost surely, 299997897 is an apocalyptic number.

It is an amenable number.

99997897 is a deficient number, since it is larger than the sum of its proper divisors (1).

99997897 is an equidigital number, since it uses as much as digits as its factorization.

99997897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23147208, while the sum is 67.

The square root of 99997897 is about 9999.8948494472. The cubic root of 99997897 is about 464.1556295847.

The spelling of 99997897 in words is "ninety-nine million, nine hundred ninety-seven thousand, eight hundred ninety-seven".