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19979539001 is a prime number
BaseRepresentation
bin10010100110110111…
…111001001000111001
31220120102000202000222
4102212313321020321
5311404230222001
613102314505425
71305053164562
oct224667711071
956512022028
1019979539001
118522a24404
123a57135275
131b65392736
14d776bb169
157be07861b
hex4a6df9239

19979539001 has 2 divisors, whose sum is σ = 19979539002. Its totient is φ = 19979539000.

The previous prime is 19979538973. The next prime is 19979539043. The reversal of 19979539001 is 10093597991.

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., 16577850025 + 3401688976 = 128755^2 + 58324^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-19979539001 is a prime.

It is not a weakly prime, because it can be changed into another prime (19979539061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9989769500 + 9989769501.

It is an arithmetic number, because the mean of its divisors is an integer number (9989769501).

Almost surely, 219979539001 is an apocalyptic number.

It is an amenable number.

19979539001 is a deficient number, since it is larger than the sum of its proper divisors (1).

19979539001 is an equidigital number, since it uses as much as digits as its factorization.

19979539001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 688905, while the sum is 53.

The spelling of 19979539001 in words is "nineteen billion, nine hundred seventy-nine million, five hundred thirty-nine thousand, one".