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997628309 is a prime number
BaseRepresentation
bin111011011101101…
…001100110010101
32120112012202202122
4323131221212111
54020343101214
6242554345325
733502462226
oct7335514625
92515182678
10997628309
11472153a07
1223a12b245
1312b8b9812
14966d124d
155c8b388e
hex3b769995

997628309 has 2 divisors, whose sum is σ = 997628310. Its totient is φ = 997628308.

The previous prime is 997628287. The next prime is 997628321. The reversal of 997628309 is 903826799.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 707028100 + 290600209 = 26590^2 + 17047^2 .

It is an emirp because it is prime and its reverse (903826799) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 997628309 - 228 = 729192853 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997628369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498814154 + 498814155.

It is an arithmetic number, because the mean of its divisors is an integer number (498814155).

Almost surely, 2997628309 is an apocalyptic number.

It is an amenable number.

997628309 is a deficient number, since it is larger than the sum of its proper divisors (1).

997628309 is an equidigital number, since it uses as much as digits as its factorization.

997628309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1469664, while the sum is 53.

The square root of 997628309 is about 31585.2546135060. The cubic root of 997628309 is about 999.2088105176.

The spelling of 997628309 in words is "nine hundred ninety-seven million, six hundred twenty-eight thousand, three hundred nine".