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1315807993 is a prime number
BaseRepresentation
bin100111001101101…
…1010001011111001
310101200220222020101
41032123122023321
510143321323433
6334322155401
744415116623
oct11633321371
93350828211
101315807993
11615815025
123087b2b61
1317c7b1316
14c6a77c13
157a7b407d
hex4e6da2f9

1315807993 has 2 divisors, whose sum is σ = 1315807994. Its totient is φ = 1315807992.

The previous prime is 1315807979. The next prime is 1315808009. The reversal of 1315807993 is 3997085131.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 881377344 + 434430649 = 29688^2 + 20843^2 .

It is a cyclic number.

It is not a de Polignac number, because 1315807993 - 225 = 1282253561 is a prime.

It is not a weakly prime, because it can be changed into another prime (1315307993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 657903996 + 657903997.

It is an arithmetic number, because the mean of its divisors is an integer number (657903997).

Almost surely, 21315807993 is an apocalyptic number.

It is an amenable number.

1315807993 is a deficient number, since it is larger than the sum of its proper divisors (1).

1315807993 is an equidigital number, since it uses as much as digits as its factorization.

1315807993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 204120, while the sum is 46.

The square root of 1315807993 is about 36274.0677757541. The cubic root of 1315807993 is about 1095.7988493800.

The spelling of 1315807993 in words is "one billion, three hundred fifteen million, eight hundred seven thousand, nine hundred ninety-three".