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997927813 is a prime number
BaseRepresentation
bin111011011110110…
…010101110000101
32120112202222121101
4323132302232011
54020432142223
6243005020101
733505150351
oct7336625605
92515688541
10997927813
11472338a33
1223a254631
1312b992c3c
149676c461
155c9224ad
hex3b7b2b85

997927813 has 2 divisors, whose sum is σ = 997927814. Its totient is φ = 997927812.

The previous prime is 997927807. The next prime is 997927849. The reversal of 997927813 is 318729799.

997927813 = 223372 + 223382.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 498986244 + 498941569 = 22338^2 + 22337^2 .

It is an emirp because it is prime and its reverse (318729799) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-997927813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997927213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498963906 + 498963907.

It is an arithmetic number, because the mean of its divisors is an integer number (498963907).

Almost surely, 2997927813 is an apocalyptic number.

997927813 is the 22338-th centered square number.

It is an amenable number.

997927813 is a deficient number, since it is larger than the sum of its proper divisors (1).

997927813 is an equidigital number, since it uses as much as digits as its factorization.

997927813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1714608, while the sum is 55.

The square root of 997927813 is about 31589.9954574229. The cubic root of 997927813 is about 999.3087933434.

The spelling of 997927813 in words is "nine hundred ninety-seven million, nine hundred twenty-seven thousand, eight hundred thirteen".